diff --git a/src/App.tsx b/src/App.tsx
index 017957182..6910d9f29 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -1,60 +1,107 @@
-import classNames from 'classnames';
-
 import 'bulma/css/bulma.css';
 import '@fortawesome/fontawesome-free/css/all.css';
 import './App.scss';
 
-import { PostsList } from './components/PostsList';
-import { PostDetails } from './components/PostDetails';
 import { UserSelector } from './components/UserSelector';
+import { useEffect, useState } from 'react';
+import { User } from './types/User';
+import { getUsers } from './api/users';
 import { Loader } from './components/Loader';
+import { PostsList } from './components/PostsList/PostsList';
+import { Post } from './types/Post';
+import { getPosts } from './api/posts';
+import { PostDetails } from './components/PostDetails';
+import classNames from 'classnames';
 
-export const App = () => (
-  <main className="section">
-    <div className="container">
-      <div className="tile is-ancestor">
-        <div className="tile is-parent">
-          <div className="tile is-child box is-success">
-            <div className="block">
-              <UserSelector />
-            </div>
+export const App = () => {
+  const [users, setUsers] = useState<User[]>([]);
+  const [posts, setPosts] = useState<Post[]>([]);
+  const [selectedPost, setSelectedPost] = useState<Post | null>(null);
+  const [notification, setNotification] = useState('');
+  const [isLoading, setIsLoading] = useState(false);
 
-            <div className="block" data-cy="MainContent">
-              <p data-cy="NoSelectedUser">No user selected</p>
+  // #region load
+  useEffect(() => {
+    getUsers().then(setUsers);
+  }, []);
+  // #endregion
 
-              <Loader />
+  const handleLoadPosts = async (userId: number) => {
+    setIsLoading(true);
+    setPosts([]);
+    setNotification('');
+    setSelectedPost(null);
 
-              <div
-                className="notification is-danger"
-                data-cy="PostsLoadingError"
-              >
-                Something went wrong!
-              </div>
+    try {
+      const loadedPosts = await getPosts(userId);
 
-              <div className="notification is-warning" data-cy="NoPostsYet">
-                No posts yet
+      if (loadedPosts.length === 0) {
+        setNotification('is-warning');
+      }
+
+      setPosts(loadedPosts);
+    } catch {
+      setNotification('is-danger');
+    } finally {
+      setIsLoading(false);
+    }
+  };
+
+  return (
+    <main className="section">
+      <div className="container">
+        <div className="tile is-ancestor">
+          <div className="tile is-parent">
+            <div className="tile is-child box is-success">
+              <div className="block">
+                <UserSelector users={users} onSelect={handleLoadPosts} />
               </div>
 
-              <PostsList />
+              <div className="block" data-cy="MainContent">
+                {!isLoading && posts.length === 0 && !notification && (
+                  <p data-cy="NoSelectedUser">No user selected</p>
+                )}
+                {!isLoading && posts.length > 0 && (
+                  <PostsList posts={posts} onSelect={setSelectedPost} />
+                )}
+                {isLoading && <Loader />}
+
+                {notification === 'is-danger' && (
+                  <div
+                    className="notification is-danger"
+                    data-cy="PostsLoadingError"
+                  >
+                    Something went wrong!
+                  </div>
+                )}
+
+                {notification === 'is-warning' && (
+                  <div className="notification is-warning" data-cy="NoPostsYet">
+                    No posts yet
+                  </div>
+                )}
+              </div>
             </div>
           </div>
-        </div>
 
-        <div
-          data-cy="Sidebar"
-          className={classNames(
-            'tile',
-            'is-parent',
-            'is-8-desktop',
-            'Sidebar',
-            'Sidebar--open',
-          )}
-        >
-          <div className="tile is-child box is-success ">
-            <PostDetails />
+          <div
+            data-cy="Sidebar"
+            className={classNames(
+              'tile',
+              'is-parent',
+              'is-8-desktop',
+              'Sidebar',
+              { 'Sidebar--open': selectedPost },
+            )}
+          >
+            {selectedPost && (
+              <div className="tile is-child box is-success">
+                <PostDetails post={selectedPost} />
+              </div>
+            )}
           </div>
         </div>
       </div>
-    </div>
-  </main>
-);
+    </main>
+  );
+};
diff --git a/src/api/comments.tsx b/src/api/comments.tsx
new file mode 100644
index 000000000..f1de03a67
--- /dev/null
+++ b/src/api/comments.tsx
@@ -0,0 +1,14 @@
+import { Comment } from '../types/Comment';
+import { client } from '../utils/fetchClient';
+
+export const getComments = (postId: number) => {
+  return client.get<Comment[]>(`/comments?postId=${postId}`);
+};
+
+export const deleteComment = (commentId: number) => {
+  return client.delete(`/comments/${commentId}`);
+};
+
+export const addComment = ({ name, email, body, postId }: Comment) => {
+  return client.post<Comment>(`/comments`, { name, email, body, postId });
+};
diff --git a/src/api/posts.tsx b/src/api/posts.tsx
new file mode 100644
index 000000000..a6a1739ec
--- /dev/null
+++ b/src/api/posts.tsx
@@ -0,0 +1,6 @@
+import { Post } from '../types/Post';
+import { client } from '../utils/fetchClient';
+
+export const getPosts = (userId: number) => {
+  return client.get<Post[]>(`/posts?userId=${userId}`);
+};
diff --git a/src/api/users.tsx b/src/api/users.tsx
new file mode 100644
index 000000000..386bfacd5
--- /dev/null
+++ b/src/api/users.tsx
@@ -0,0 +1,6 @@
+import { User } from '../types/User';
+import { client } from '../utils/fetchClient';
+
+export const getUsers = () => {
+  return client.get<User[]>(`/users`);
+};
diff --git a/src/components/NewCommentForm.tsx b/src/components/NewCommentForm.tsx
deleted file mode 100644
index 73a8a0b45..000000000
--- a/src/components/NewCommentForm.tsx
+++ /dev/null
@@ -1,103 +0,0 @@
-import React from 'react';
-
-export const NewCommentForm: React.FC = () => {
-  return (
-    <form data-cy="NewCommentForm">
-      <div className="field" data-cy="NameField">
-        <label className="label" htmlFor="comment-author-name">
-          Author Name
-        </label>
-
-        <div className="control has-icons-left has-icons-right">
-          <input
-            type="text"
-            name="name"
-            id="comment-author-name"
-            placeholder="Name Surname"
-            className="input is-danger"
-          />
-
-          <span className="icon is-small is-left">
-            <i className="fas fa-user" />
-          </span>
-
-          <span
-            className="icon is-small is-right has-text-danger"
-            data-cy="ErrorIcon"
-          >
-            <i className="fas fa-exclamation-triangle" />
-          </span>
-        </div>
-
-        <p className="help is-danger" data-cy="ErrorMessage">
-          Name is required
-        </p>
-      </div>
-
-      <div className="field" data-cy="EmailField">
-        <label className="label" htmlFor="comment-author-email">
-          Author Email
-        </label>
-
-        <div className="control has-icons-left has-icons-right">
-          <input
-            type="text"
-            name="email"
-            id="comment-author-email"
-            placeholder="email@test.com"
-            className="input is-danger"
-          />
-
-          <span className="icon is-small is-left">
-            <i className="fas fa-envelope" />
-          </span>
-
-          <span
-            className="icon is-small is-right has-text-danger"
-            data-cy="ErrorIcon"
-          >
-            <i className="fas fa-exclamation-triangle" />
-          </span>
-        </div>
-
-        <p className="help is-danger" data-cy="ErrorMessage">
-          Email is required
-        </p>
-      </div>
-
-      <div className="field" data-cy="BodyField">
-        <label className="label" htmlFor="comment-body">
-          Comment Text
-        </label>
-
-        <div className="control">
-          <textarea
-            id="comment-body"
-            name="body"
-            placeholder="Type comment here"
-            className="textarea is-danger"
-          />
-        </div>
-
-        <p className="help is-danger" data-cy="ErrorMessage">
-          Enter some text
-        </p>
-      </div>
-
-      <div className="field is-grouped">
-        <div className="control">
-          <button type="submit" className="button is-link is-loading">
-            Add
-          </button>
-        </div>
-
-        <div className="control">
-          {/* eslint-disable-next-line react/button-has-type */}
-          <button type="reset" className="button is-link is-light">
-            Clear
-          </button>
-        </div>
-      </div>
-    </form>
-  );
-};
diff --git a/src/components/NewCommentForm/NewCommentForm.tsx b/src/components/NewCommentForm/NewCommentForm.tsx
new file mode 100644
index 000000000..bb112e478
--- /dev/null
+++ b/src/components/NewCommentForm/NewCommentForm.tsx
@@ -0,0 +1,200 @@
+import classNames from 'classnames';
+import React, { useState } from 'react';
+import { Comment } from '../../types/Comment';
+
+interface Props {
+  error: boolean;
+  loading: boolean;
+  onAdd: (comment: Omit<Comment, 'postId'>) => void;
+}
+
+export const NewCommentForm: React.FC<Props> = ({ error, loading, onAdd }) => {
+  const [name, setName] = useState('');
+  const [hasNameError, setHasNameError] = useState(false);
+
+  const [email, setEmail] = useState('');
+  const [hasEmailError, setHasEmailError] = useState(false);
+
+  const [body, setBody] = useState('');
+  const [hasBodyError, setHasBodyError] = useState(false);
+
+  const reset = () => {
+    setName('');
+    setEmail('');
+    setBody('');
+
+    setHasNameError(false);
+    setHasEmailError(false);
+    setHasBodyError(false);
+  };
+
+  const handleOnChangeName = (event: React.ChangeEvent<HTMLInputElement>) => {
+    setHasNameError(false);
+
+    setName(event.target.value);
+  };
+
+  const handleOnChangeEmail = (event: React.ChangeEvent<HTMLInputElement>) => {
+    setHasEmailError(false);
+
+    setEmail(event.target.value);
+  };
+
+  const handleOnChangeBody = (
+    event: React.ChangeEvent<HTMLTextAreaElement>,
+  ) => {
+    setHasBodyError(false);
+
+    setBody(event.target.value);
+  };
+
+  const handleOnSubmit = (event: React.FormEvent<HTMLFormElement>) => {
+    event.preventDefault();
+
+    setHasNameError(!name);
+    setHasEmailError(!email);
+    setHasBodyError(!body);
+
+    if (!name || !email || !body) {
+      return;
+    }
+
+    onAdd({
+      name,
+      email,
+      body,
+      id: 0,
+    });
+
+    setBody('');
+  };
+
+  return (
+    <form data-cy="NewCommentForm" onSubmit={handleOnSubmit}>
+      {!error && (
+        <>
+          <div className="field" data-cy="NameField">
+            <label className="label" htmlFor="comment-author-name">
+              Author Name
+            </label>
+
+            <div className="control has-icons-left has-icons-right">
+              <input
+                type="text"
+                name="name"
+                id="comment-author-name"
+                placeholder="Name Surname"
+                value={name}
+                className={classNames('input', { 'is-danger': hasNameError })}
+                onChange={handleOnChangeName}
+              />
+
+              <span className="icon is-small is-left">
+                <i className="fas fa-user" />
+              </span>
+
+              {hasNameError && (
+                <span
+                  className="icon is-small is-right has-text-danger"
+                  data-cy="ErrorIcon"
+                >
+                  <i className="fas fa-exclamation-triangle" />
+                </span>
+              )}
+            </div>
+
+            {hasNameError && (
+              <p className="help is-danger" data-cy="ErrorMessage">
+                Name is required
+              </p>
+            )}
+          </div>
+
+          <div className="field" data-cy="EmailField">
+            <label className="label" htmlFor="comment-author-email">
+              Author Email
+            </label>
+
+            <div className="control has-icons-left has-icons-right">
+              <input
+                type="text"
+                name="email"
+                id="comment-author-email"
+                placeholder="email@test.com"
+                value={email}
+                className={classNames('input', { 'is-danger': hasEmailError })}
+                onChange={handleOnChangeEmail}
+              />
+
+              <span className="icon is-small is-left">
+                <i className="fas fa-envelope" />
+              </span>
+
+              {hasEmailError && (
+                <span
+                  className="icon is-small is-right has-text-danger"
+                  data-cy="ErrorIcon"
+                >
+                  <i className="fas fa-exclamation-triangle" />
+                </span>
+              )}
+            </div>
+
+            {hasEmailError && (
+              <p className="help is-danger" data-cy="ErrorMessage">
+                Email is required
+              </p>
+            )}
+          </div>
+
+          <div className="field" data-cy="BodyField">
+            <label className="label" htmlFor="comment-body">
+              Comment Text
+            </label>
+
+            <div className="control">
+              <textarea
+                id="comment-body"
+                name="body"
+                placeholder="Type comment here"
+                value={body}
+                className={classNames('input', { 'is-danger': hasBodyError })}
+                onChange={handleOnChangeBody}
+              />
+            </div>
+
+            {hasBodyError && (
+              <p className="help is-danger" data-cy="ErrorMessage">
+                Enter some text
+              </p>
+            )}
+          </div>
+
+          <div className="field is-grouped">
+            <div className="control">
+              <button
+                type="submit"
+                className={classNames('button is-link', {
+                  'is-loading': loading,
+                })}
+              >
+                Add
+              </button>
+            </div>
+
+            <div className="control">
+              {/* eslint-disable-next-line react/button-has-type */}
+              <button
+                type="reset"
+                className="button is-link is-light"
+                onClick={reset}
+              >
+                Clear
+              </button>
+            </div>
+          </div>
+        </>
+      )}
+    </form>
+  );
+};
diff --git a/src/components/NewCommentForm/index.js b/src/components/NewCommentForm/index.js
new file mode 100644
index 000000000..49cd052cd
--- /dev/null
+++ b/src/components/NewCommentForm/index.js
@@ -0,0 +1 @@
+export * from './NewCommentForm';
diff --git a/src/components/PostDetails.tsx b/src/components/PostDetails.tsx
deleted file mode 100644
index 2f82db916..000000000
--- a/src/components/PostDetails.tsx
+++ /dev/null
@@ -1,107 +0,0 @@
-import React from 'react';
-import { Loader } from './Loader';
-import { NewCommentForm } from './NewCommentForm';
-
-export const PostDetails: React.FC = () => {
-  return (
-    <div className="content" data-cy="PostDetails">
-      <div className="content" data-cy="PostDetails">
-        <div className="block">
-          <h2 data-cy="PostTitle">
-            #18: voluptate et itaque vero tempora molestiae
-          </h2>
-
-          <p data-cy="PostBody">
-            eveniet quo quis laborum totam consequatur non dolor ut et est
-            repudiandae est voluptatem vel debitis et magnam
-          </p>
-        </div>
-
-        <div className="block">
-          <Loader />
-
-          <div className="notification is-danger" data-cy="CommentsError">
-            Something went wrong
-          </div>
-
-          <p className="title is-4" data-cy="NoCommentsMessage">
-            No comments yet
-          </p>
-
-          <p className="title is-4">Comments:</p>
-
-          <article className="message is-small" data-cy="Comment">
-            <div className="message-header">
-              <a href="mailto:misha@mate.academy" data-cy="CommentAuthor">
-                Misha Hrynko
-              </a>
-              <button
-                data-cy="CommentDelete"
-                type="button"
-                className="delete is-small"
-                aria-label="delete"
-              >
-                delete button
-              </button>
-            </div>
-
-            <div className="message-body" data-cy="CommentBody">
-              Some comment
-            </div>
-          </article>
-
-          <article className="message is-small" data-cy="Comment">
-            <div className="message-header">
-              <a href="mailto:misha@mate.academy" data-cy="CommentAuthor">
-                Misha Hrynko
-              </a>
-
-              <button
-                data-cy="CommentDelete"
-                type="button"
-                className="delete is-small"
-                aria-label="delete"
-              >
-                delete button
-              </button>
-            </div>
-            <div className="message-body" data-cy="CommentBody">
-              One more comment
-            </div>
-          </article>
-
-          <article className="message is-small" data-cy="Comment">
-            <div className="message-header">
-              <a href="mailto:misha@mate.academy" data-cy="CommentAuthor">
-                Misha Hrynko
-              </a>
-
-              <button
-                data-cy="CommentDelete"
-                type="button"
-                className="delete is-small"
-                aria-label="delete"
-              >
-                delete button
-              </button>
-            </div>
-
-            <div className="message-body" data-cy="CommentBody">
-              {'Multi\nline\ncomment'}
-            </div>
-          </article>
-
-          <button
-            data-cy="WriteCommentButton"
-            type="button"
-            className="button is-link"
-          >
-            Write a comment
-          </button>
-        </div>
-
-        <NewCommentForm />
-      </div>
-    </div>
-  );
-};
diff --git a/src/components/PostDetails/PostDetails.tsx b/src/components/PostDetails/PostDetails.tsx
new file mode 100644
index 000000000..df8fe6580
--- /dev/null
+++ b/src/components/PostDetails/PostDetails.tsx
@@ -0,0 +1,164 @@
+import React, { useEffect, useState } from 'react';
+import { addComment, deleteComment, getComments } from '../../api/comments';
+import { Comment } from '../../types/Comment';
+import { Post } from '../../types/Post';
+import { Loader } from '../Loader';
+import { NewCommentForm } from '../NewCommentForm/NewCommentForm';
+
+interface Props {
+  post: Post;
+}
+
+export const PostDetails: React.FC<Props> = ({ post }) => {
+  const [comments, setComments] = useState<Comment[]>([]);
+  const [error, setError] = useState(false);
+  const [message, setMessage] = useState(false);
+  const [isLoading, setIsLoading] = useState(false);
+  const [isWriting, setIsWriting] = useState(false);
+
+  const loadComments = async (postId: number) => {
+    setIsLoading(true);
+    setError(false);
+    setMessage(false);
+    setIsWriting(false);
+    setComments([]);
+
+    try {
+      const loadedComments = await getComments(postId);
+
+      if (loadedComments.length === 0) {
+        setMessage(true);
+      }
+
+      setComments(loadedComments);
+    } catch {
+      setError(true);
+    } finally {
+      setIsLoading(false);
+    }
+  };
+
+  useEffect(() => {
+    loadComments(post.id);
+  }, [post]);
+
+  const onDelete = async (commentId: number) => {
+    try {
+      await deleteComment(commentId);
+
+      const newComments = comments.filter(comment => comment.id !== commentId);
+
+      if (newComments.length === 0) {
+        setMessage(true);
+      }
+
+      setComments(newComments);
+    } catch {
+      setError(true);
+    }
+  };
+
+  const onAdd = async ({ name, email, body, id }: Omit<Comment, 'postId'>) => {
+    setIsLoading(true);
+    setMessage(false);
+
+    try {
+      const newComment = await addComment({
+        name,
+        email,
+        body,
+        postId: post.id,
+        id,
+      });
+
+      setComments(prevComments => [...prevComments, newComment]);
+    } catch {
+      setError(true);
+    } finally {
+      setIsLoading(false);
+    }
+  };
+
+  return (
+    <div className="content" data-cy="PostDetails">
+      <div className="content" data-cy="PostDetails">
+        <div className="block">
+          <h2 data-cy="PostTitle">{`#${post.id}: ${post.title}`}</h2>
+
+          <p data-cy="PostBody">{post.body}</p>
+        </div>
+
+        <div className="block">
+          {isLoading && !isWriting ? (
+            <Loader />
+          ) : (
+            <>
+              {error && (
+                <div className="notification is-danger" data-cy="CommentsError">
+                  Something went wrong
+                </div>
+              )}
+
+              {message && !error && (
+                <p className="title is-4" data-cy="NoCommentsMessage">
+                  No comments yet
+                </p>
+              )}
+
+              {!message && !error && (
+                <>
+                  <p className="title is-4">Comments:</p>
+
+                  {comments.map(comment => (
+                    <article
+                      className="message is-small"
+                      data-cy="Comment"
+                      key={comment.id}
+                    >
+                      <div className="message-header">
+                        <a
+                          href={`mailto:${comment.email}`}
+                          data-cy="CommentAuthor"
+                        >
+                          {comment.name}
+                        </a>
+                        <button
+                          data-cy="CommentDelete"
+                          type="button"
+                          className="delete is-small"
+                          aria-label="delete"
+                          onClick={() => onDelete(comment.id)}
+                        >
+                          delete button
+                        </button>
+                      </div>
+
+                      <div className="message-body" data-cy="CommentBody">
+                        {comment.body}
+                      </div>
+                    </article>
+                  ))}
+                </>
+              )}
+
+              {!isWriting && !error && (
+                <button
+                  data-cy="WriteCommentButton"
+                  type="button"
+                  className="button is-link"
+                  onClick={() => setIsWriting(true)}
+                >
+                  Write a comment
+                </button>
+              )}
+            </>
+          )}
+        </div>
+
+        {isWriting && (
+          <NewCommentForm error={error} loading={isLoading} onAdd={onAdd} />
+        )}
+      </div>
+    </div>
+  );
+};
diff --git a/src/components/PostDetails/index.js b/src/components/PostDetails/index.js
new file mode 100644
index 000000000..d0d5ae35c
--- /dev/null
+++ b/src/components/PostDetails/index.js
@@ -0,0 +1 @@
+export * from './PostDetails';
diff --git a/src/components/PostsList.tsx b/src/components/PostsList.tsx
deleted file mode 100644
index cf90f04b0..000000000
--- a/src/components/PostsList.tsx
+++ /dev/null
@@ -1,86 +0,0 @@
-import React from 'react';
-
-export const PostsList: React.FC = () => (
-  <div data-cy="PostsList">
-    <p className="title">Posts:</p>
-
-    <table className="table is-fullwidth is-striped is-hoverable is-narrow">
-      <thead>
-        <tr className="has-background-link-light">
-          <th>#</th>
-          <th>Title</th>
-          {/* eslint-disable-next-line jsx-a11y/control-has-associated-label */}
-          <th> </th>
-        </tr>
-      </thead>
-
-      <tbody>
-        <tr data-cy="Post">
-          <td data-cy="PostId">17</td>
-
-          <td data-cy="PostTitle">
-            fugit voluptas sed molestias voluptatem provident
-          </td>
-
-          <td className="has-text-right is-vcentered">
-            <button
-              type="button"
-              data-cy="PostButton"
-              className="button is-link is-light"
-            >
-              Open
-            </button>
-          </td>
-        </tr>
-
-        <tr data-cy="Post">
-          <td data-cy="PostId">18</td>
-
-          <td data-cy="PostTitle">
-            voluptate et itaque vero tempora molestiae
-          </td>
-
-          <td className="has-text-right is-vcentered">
-            <button
-              type="button"
-              data-cy="PostButton"
-              className="button is-link"
-            >
-              Close
-            </button>
-          </td>
-        </tr>
-
-        <tr data-cy="Post">
-          <td data-cy="PostId">19</td>
-          <td data-cy="PostTitle">adipisci placeat illum aut reiciendis qui</td>
-
-          <td className="has-text-right is-vcentered">
-            <button
-              type="button"
-              data-cy="PostButton"
-              className="button is-link is-light"
-            >
-              Open
-            </button>
-          </td>
-        </tr>
-
-        <tr data-cy="Post">
-          <td data-cy="PostId">20</td>
-          <td data-cy="PostTitle">doloribus ad provident suscipit at</td>
-
-          <td className="has-text-right is-vcentered">
-            <button
-              type="button"
-              data-cy="PostButton"
-              className="button is-link is-light"
-            >
-              Open
-            </button>
-          </td>
-        </tr>
-      </tbody>
-    </table>
-  </div>
-);
diff --git a/src/components/PostsList/PostsList.tsx b/src/components/PostsList/PostsList.tsx
new file mode 100644
index 000000000..2df707ad1
--- /dev/null
+++ b/src/components/PostsList/PostsList.tsx
@@ -0,0 +1,62 @@
+import classNames from 'classnames';
+import React, { useState } from 'react';
+import { Post } from '../../types/Post';
+
+interface Props {
+  posts: Post[];
+  onSelect: (post: Post | null) => void;
+}
+
+export const PostsList: React.FC<Props> = ({ posts, onSelect }) => {
+  const [selectedPost, setSelectedPost] = useState<Post | null>(null);
+
+  const handleOnClick = (post: Post) => {
+    const newSelectedPost =
+      selectedPost && selectedPost.id === post.id ? null : post;
+
+    setSelectedPost(newSelectedPost);
+    onSelect(newSelectedPost);
+  };
+
+  return (
+    <div data-cy="PostsList">
+      <p className="title">Posts:</p>
+
+      <table className="table is-fullwidth is-striped is-hoverable is-narrow">
+        <thead>
+          <tr className="has-background-link-light">
+            <th>#</th>
+            <th>Title</th>
+            {/* eslint-disable-next-line jsx-a11y/control-has-associated-label */}
+            <th> </th>
+          </tr>
+        </thead>
+
+        <tbody>
+          {posts.map(post => (
+            <tr data-cy="Post" key={post.id}>
+              <td data-cy="PostId">{post.id}</td>
+
+              <td data-cy="PostTitle">{post.title}</td>
+
+              <td className="has-text-right is-vcentered">
+                <button
+                  type="button"
+                  data-cy="PostButton"
+                  className={classNames('button is-link', {
+                    'is-light': !selectedPost || selectedPost.id !== post.id,
+                  })}
+                  onClick={() => handleOnClick(post)}
+                >
+                  {!selectedPost || selectedPost.id !== post.id
+                    ? 'Open'
+                    : 'Close'}
+                </button>
+              </td>
+            </tr>
+          ))}
+        </tbody>
+      </table>
+    </div>
+  );
+};
diff --git a/src/components/PostsList/index.js b/src/components/PostsList/index.js
new file mode 100644
index 000000000..41c5eee64
--- /dev/null
+++ b/src/components/PostsList/index.js
@@ -0,0 +1 @@
+export * from './PostsList';
diff --git a/src/components/UserSelector.tsx b/src/components/UserSelector.tsx
deleted file mode 100644
index c89442841..000000000
--- a/src/components/UserSelector.tsx
+++ /dev/null
@@ -1,42 +0,0 @@
-import React from 'react';
-
-export const UserSelector: React.FC = () => {
-  return (
-    <div data-cy="UserSelector" className="dropdown is-active">
-      <div className="dropdown-trigger">
-        <button
-          type="button"
-          className="button"
-          aria-haspopup="true"
-          aria-controls="dropdown-menu"
-        >
-          <span>Choose a user</span>
-
-          <span className="icon is-small">
-            <i className="fas fa-angle-down" aria-hidden="true" />
-          </span>
-        </button>
-      </div>
-
-      <div className="dropdown-menu" id="dropdown-menu" role="menu">
-        <div className="dropdown-content">
-          <a href="#user-1" className="dropdown-item">
-            Leanne Graham
-          </a>
-          <a href="#user-2" className="dropdown-item is-active">
-            Ervin Howell
-          </a>
-          <a href="#user-3" className="dropdown-item">
-            Clementine Bauch
-          </a>
-          <a href="#user-4" className="dropdown-item">
-            Patricia Lebsack
-          </a>
-          <a href="#user-5" className="dropdown-item">
-            Chelsey Dietrich
-          </a>
-        </div>
-      </div>
-    </div>
-  );
-};
diff --git a/src/components/UserSelector/UserSelector.tsx b/src/components/UserSelector/UserSelector.tsx
new file mode 100644
index 000000000..635ab8046
--- /dev/null
+++ b/src/components/UserSelector/UserSelector.tsx
@@ -0,0 +1,71 @@
+import classNames from 'classnames';
+import React, { useRef, useState } from 'react';
+import { User } from '../../types/User';
+
+interface Props {
+  users: User[];
+  onSelect: (id: number) => void;
+}
+
+export const UserSelector: React.FC<Props> = ({ users, onSelect }) => {
+  const [isActive, setIsActive] = useState(false);
+  const [selectedUser, setSelectedUser] = useState<User | null>(null);
+  const dropdownRef = useRef<HTMLDivElement | null>(null);
+
+  const handleOnSelect = (user: User) => {
+    setIsActive(false);
+    setSelectedUser(user);
+    onSelect(user.id);
+  };
+
+  const handleOnBlur = (event: React.FocusEvent) => {
+    if (
+      dropdownRef.current &&
+      !dropdownRef.current.contains(event.relatedTarget as Node)
+    ) {
+      setIsActive(false);
+    }
+  };
+
+  return (
+    <div
+      data-cy="UserSelector"
+      className={classNames('dropdown', { 'is-active': isActive })}
+      ref={dropdownRef}
+    >
+      <div className="dropdown-trigger">
+        <button
+          type="button"
+          className="button"
+          aria-haspopup="true"
+          aria-controls="dropdown-menu"
+          onClick={() => setIsActive(!isActive)}
+          onBlur={handleOnBlur}
+        >
+          <span>{selectedUser ? selectedUser.name : 'Choose a user'}</span>
+
+          <span className="icon is-small">
+            <i className="fas fa-angle-down" aria-hidden="true" />
+          </span>
+        </button>
+      </div>
+
+      <div className="dropdown-menu" id="dropdown-menu" role="menu">
+        <div className="dropdown-content">
+          {users.map(user => (
+            <a
+              key={user.id}
+              href={`#user-${user.id}`}
+              className={classNames('dropdown-item', {
+                'is-active': selectedUser && user.id === selectedUser.id,
+              })}
+              onClick={() => handleOnSelect(user)}
+            >
+              {user.name}
+            </a>
+          ))}
+        </div>
+      </div>
+    </div>
+  );
+};
diff --git a/src/components/UserSelector/index.js b/src/components/UserSelector/index.js
new file mode 100644
index 000000000..b4431162a
--- /dev/null
+++ b/src/components/UserSelector/index.js
@@ -0,0 +1 @@
+export * from './UserSelector';