diff --git a/src/App.tsx b/src/App.tsx
index a399287bd..c190703e3 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -1,156 +1,22 @@
-/* eslint-disable jsx-a11y/control-has-associated-label */
-import React from 'react';
+import React, { useContext } from 'react';
+import { Header } from './components/Header/Header';
+import { TodoList } from './components/TodoList/TodoList';
+import { Footer } from './components/Footer/Footer';
+import { TodosContext } from './components/TodosContext/TodosContext';
 
 export const App: React.FC = () => {
+  const { todos } = useContext(TodosContext);
+
   return (
     <div className="todoapp">
       <h1 className="todoapp__title">todos</h1>
 
       <div className="todoapp__content">
-        <header className="todoapp__header">
-          {/* this button should have `active` class only if all todos are completed */}
-          <button
-            type="button"
-            className="todoapp__toggle-all active"
-            data-cy="ToggleAllButton"
-          />
-
-          {/* Add a todo on form submit */}
-          <form>
-            <input
-              data-cy="NewTodoField"
-              type="text"
-              className="todoapp__new-todo"
-              placeholder="What needs to be done?"
-            />
-          </form>
-        </header>
-
-        <section className="todoapp__main" data-cy="TodoList">
-          {/* This is a completed todo */}
-          <div data-cy="Todo" className="todo completed">
-            <label className="todo__status-label">
-              <input
-                data-cy="TodoStatus"
-                type="checkbox"
-                className="todo__status"
-                checked
-              />
-            </label>
-
-            <span data-cy="TodoTitle" className="todo__title">
-              Completed Todo
-            </span>
-
-            {/* Remove button appears only on hover */}
-            <button type="button" className="todo__remove" data-cy="TodoDelete">
-              ×
-            </button>
-          </div>
-
-          {/* This todo is an active todo */}
-          <div data-cy="Todo" className="todo">
-            <label className="todo__status-label">
-              <input
-                data-cy="TodoStatus"
-                type="checkbox"
-                className="todo__status"
-              />
-            </label>
-
-            <span data-cy="TodoTitle" className="todo__title">
-              Not Completed Todo
-            </span>
-
-            <button type="button" className="todo__remove" data-cy="TodoDelete">
-              ×
-            </button>
-          </div>
-
-          {/* This todo is being edited */}
-          <div data-cy="Todo" className="todo">
-            <label className="todo__status-label">
-              <input
-                data-cy="TodoStatus"
-                type="checkbox"
-                className="todo__status"
-              />
-            </label>
-
-            {/* This form is shown instead of the title and remove button */}
-            <form>
-              <input
-                data-cy="TodoTitleField"
-                type="text"
-                className="todo__title-field"
-                placeholder="Empty todo will be deleted"
-                value="Todo is being edited now"
-              />
-            </form>
-          </div>
-
-          {/* This todo is in loadind state */}
-          <div data-cy="Todo" className="todo">
-            <label className="todo__status-label">
-              <input
-                data-cy="TodoStatus"
-                type="checkbox"
-                className="todo__status"
-              />
-            </label>
-
-            <span data-cy="TodoTitle" className="todo__title">
-              Todo is being saved now
-            </span>
-
-            <button type="button" className="todo__remove" data-cy="TodoDelete">
-              ×
-            </button>
-          </div>
-        </section>
-
-        {/* Hide the footer if there are no todos */}
-        <footer className="todoapp__footer" data-cy="Footer">
-          <span className="todo-count" data-cy="TodosCounter">
-            3 items left
-          </span>
-
-          {/* Active link should have the 'selected' class */}
-          <nav className="filter" data-cy="Filter">
-            <a
-              href="#/"
-              className="filter__link selected"
-              data-cy="FilterLinkAll"
-            >
-              All
-            </a>
-
-            <a
-              href="#/active"
-              className="filter__link"
-              data-cy="FilterLinkActive"
-            >
-              Active
-            </a>
+        <Header />
 
-            <a
-              href="#/completed"
-              className="filter__link"
-              data-cy="FilterLinkCompleted"
-            >
-              Completed
-            </a>
-          </nav>
+        {!!todos.length && <TodoList />}
 
-          {/* this button should be disabled if there are no completed todos */}
-          <button
-            type="button"
-            className="todoapp__clear-completed"
-            data-cy="ClearCompletedButton"
-          >
-            Clear completed
-          </button>
-        </footer>
+        {!!todos.length && <Footer />}
       </div>
     </div>
   );
diff --git a/src/components/Footer/Footer.tsx b/src/components/Footer/Footer.tsx
new file mode 100644
index 000000000..25e8b8222
--- /dev/null
+++ b/src/components/Footer/Footer.tsx
@@ -0,0 +1,50 @@
+import React, { useContext, useMemo } from 'react';
+import classNames from 'classnames';
+import { MethodsContext, TodosContext } from '../TodosContext/TodosContext';
+import { TodoStatus } from '../../types/TodoStatus';
+import { countActiveTodo } from '../../utils/countActiveTodo';
+
+export const Footer: React.FC = () => {
+  const { todos, activeFilter, setActiveFilter } = useContext(TodosContext);
+
+  const { clearCompleted } = useContext(MethodsContext);
+
+  const activeTodoCount = useMemo(() => countActiveTodo(todos), [todos]);
+
+  return (
+    <footer className="todoapp__footer" data-cy="Footer">
+      <span className="todo-count" data-cy="TodosCounter">
+        {activeTodoCount} items left
+      </span>
+
+      <nav className="filter" data-cy="Filter">
+        {Object.keys(TodoStatus).map(key => (
+          <a
+            key={key}
+            href={`#/${TodoStatus[key as keyof typeof TodoStatus]}`}
+            className={classNames('filter__link', {
+              selected:
+                activeFilter === TodoStatus[key as keyof typeof TodoStatus],
+            })}
+            data-cy={`FilterLink${key}`}
+            onClick={() =>
+              setActiveFilter(TodoStatus[key as keyof typeof TodoStatus])
+            }
+          >
+            {key}
+          </a>
+        ))}
+      </nav>
+
+      <button
+        type="button"
+        className="todoapp__clear-completed"
+        data-cy="ClearCompletedButton"
+        onClick={clearCompleted}
+        disabled={todos.length === activeTodoCount}
+      >
+        Clear completed
+      </button>
+    </footer>
+  );
+};
diff --git a/src/components/Header/Header.tsx b/src/components/Header/Header.tsx
new file mode 100644
index 000000000..faeec1fc5
--- /dev/null
+++ b/src/components/Header/Header.tsx
@@ -0,0 +1,58 @@
+import React, { useContext, useEffect, useMemo, useRef, useState } from 'react';
+import classNames from 'classnames';
+import { MethodsContext, TodosContext } from '../TodosContext/TodosContext';
+import { countActiveTodo } from '../../utils/countActiveTodo';
+
+export const Header: React.FC = () => {
+  const { todos } = useContext(TodosContext);
+  const { addTodo, toggleAll } = useContext(MethodsContext);
+
+  const [newTitle, setNewTitle] = useState('');
+
+  const titleInput = useRef<HTMLInputElement>(null);
+
+  useEffect(() => {
+    titleInput.current?.focus();
+  }, [todos]);
+
+  function handleSubmit(event: React.FormEvent<HTMLFormElement>) {
+    event.preventDefault();
+
+    const trimmed = newTitle.trim();
+
+    if (trimmed) {
+      addTodo(trimmed);
+      setNewTitle('');
+      titleInput.current?.focus();
+    }
+  }
+
+  const activeTodoCount = useMemo(() => countActiveTodo(todos), [todos]);
+
+  return (
+    <header className="todoapp__header">
+      {!!todos.length && (
+        <button
+          type="button"
+          className={classNames('todoapp__toggle-all', {
+            active: activeTodoCount === 0,
+          })}
+          data-cy="ToggleAllButton"
+          onClick={toggleAll}
+        />
+      )}
+
+      <form onSubmit={handleSubmit}>
+        <input
+          data-cy="NewTodoField"
+          type="text"
+          className="todoapp__new-todo"
+          placeholder="What needs to be done?"
+          ref={titleInput}
+          value={newTitle}
+          onChange={event => setNewTitle(event.target.value)}
+        />
+      </form>
+    </header>
+  );
+};
diff --git a/src/components/TodoItem/TodoItem.tsx b/src/components/TodoItem/TodoItem.tsx
new file mode 100644
index 000000000..1dd9bb583
--- /dev/null
+++ b/src/components/TodoItem/TodoItem.tsx
@@ -0,0 +1,100 @@
+/* eslint-disable jsx-a11y/label-has-associated-control */
+import React, { useContext, useEffect, useRef, useState } from 'react';
+import classNames from 'classnames';
+import { MethodsContext } from '../TodosContext/TodosContext';
+import { Todo } from '../../types/Todo';
+
+type Props = {
+  todo: Todo;
+};
+
+export const TodoItem: React.FC<Props> = ({ todo }) => {
+  const { id, title, completed } = todo;
+  const { deleteTodo, toggleTodo, renameTodo } = useContext(MethodsContext);
+
+  const [isEditing, setIsEditing] = useState(false);
+  const [newTitle, setNewTitle] = useState(title);
+
+  const inputRef = useRef<HTMLInputElement>(null);
+
+  useEffect(() => {
+    if (isEditing && inputRef.current) {
+      inputRef.current.focus();
+    }
+  }, [isEditing]);
+
+  function saveChanges() {
+    const trimmed = newTitle.trim();
+
+    if (trimmed) {
+      renameTodo(todo.id, trimmed);
+    } else {
+      deleteTodo(todo.id);
+    }
+
+    setIsEditing(false);
+  }
+
+  function handleSubmitForm(event: React.FormEvent<HTMLFormElement>) {
+    event.preventDefault();
+
+    saveChanges();
+  }
+
+  const handleKeyUp = (event: React.KeyboardEvent<HTMLInputElement>) => {
+    if (event.key === 'Enter') {
+      saveChanges();
+    } else if (event.key === 'Escape') {
+      setIsEditing(false);
+      setNewTitle(title);
+    }
+  };
+
+  return (
+    <div data-cy="Todo" className={classNames('todo', { completed })}>
+      <label className="todo__status-label">
+        <input
+          data-cy="TodoStatus"
+          type="checkbox"
+          className="todo__status"
+          checked={completed}
+          onChange={() => toggleTodo(todo.id)}
+        />
+      </label>
+
+      {isEditing ? (
+        <form onSubmit={handleSubmitForm}>
+          <input
+            ref={inputRef}
+            data-cy="TodoTitleField"
+            type="text"
+            className="todo__title-field"
+            placeholder="Empty todo will be deleted"
+            value={newTitle}
+            onChange={event => setNewTitle(event.target.value)}
+            onKeyDown={handleKeyUp}
+            onBlur={saveChanges}
+          />
+        </form>
+      ) : (
+        <>
+          <span
+            data-cy="TodoTitle"
+            className="todo__title"
+            onDoubleClick={() => setIsEditing(true)}
+          >
+            {title}
+          </span>
+          <button
+            type="button"
+            className="todo__remove"
+            data-cy="TodoDelete"
+            onClick={() => deleteTodo(id)}
+          >
+            ×
+          </button>
+        </>
+      )}
+    </div>
+  );
+};
diff --git a/src/components/TodoList/TodoList.tsx b/src/components/TodoList/TodoList.tsx
new file mode 100644
index 000000000..fedf104c7
--- /dev/null
+++ b/src/components/TodoList/TodoList.tsx
@@ -0,0 +1,15 @@
+import { useContext } from 'react';
+import { TodoItem } from '../TodoItem/TodoItem';
+import { TodosContext } from '../TodosContext/TodosContext';
+
+export const TodoList: React.FC = () => {
+  const { filtredTodos } = useContext(TodosContext);
+
+  return (
+    <section className="todoapp__main" data-cy="TodoList">
+      {filtredTodos.map(todo => (
+        <TodoItem key={todo.id} todo={todo} />
+      ))}
+    </section>
+  );
+};
diff --git a/src/components/TodosContext/TodosContext.tsx b/src/components/TodosContext/TodosContext.tsx
new file mode 100644
index 000000000..c4495b734
--- /dev/null
+++ b/src/components/TodosContext/TodosContext.tsx
@@ -0,0 +1,111 @@
+/* eslint-disable @typescript-eslint/no-unused-vars */
+import React, { useMemo, useState } from 'react';
+import { TodoStatus } from '../../types/TodoStatus';
+import { Todo } from '../../types/Todo';
+import { getFiltredTodos } from '../../utils/getFiltredTodos';
+import { useLocalStorage } from '../../hooks/useLocalStorage';
+
+interface Methods {
+  addTodo: (title: string) => void;
+  deleteTodo: (id: number) => void;
+  toggleTodo: (id: number) => void;
+  renameTodo: (id: number, title: string) => void;
+  toggleAll: () => void;
+  clearCompleted: () => void;
+}
+
+export const MethodsContext = React.createContext<Methods>({
+  addTodo: () => {},
+  deleteTodo: () => {},
+  toggleTodo: () => {},
+  renameTodo: () => {},
+  toggleAll: () => {},
+  clearCompleted: () => {},
+});
+
+type Context = {
+  todos: Todo[];
+  filtredTodos: Todo[];
+  setTodos: (newTodos: Todo[]) => void;
+  activeFilter: TodoStatus;
+  setActiveFilter: (newActiveFilter: TodoStatus) => void;
+};
+
+export const TodosContext = React.createContext<Context>({
+  todos: [],
+  filtredTodos: [],
+  setTodos: () => {},
+  activeFilter: TodoStatus.All,
+  setActiveFilter: () => {},
+});
+
+type Props = {
+  children: React.ReactNode;
+};
+
+export const TodosProvider: React.FC<Props> = ({ children }) => {
+  const [todos, setTodos] = useLocalStorage<Todo[]>('todos', []);
+  const [activeFilter, setActiveFilter] = useState<TodoStatus>(TodoStatus.All);
+
+  const methods = useMemo(
+    () => ({
+      addTodo(title: string) {
+        const newTodo: Todo = {
+          id: Date.now(),
+          title,
+          completed: false,
+        };
+
+        setTodos([...todos, newTodo]);
+      },
+
+      deleteTodo(id: number) {
+        setTodos(todos.filter(todo => todo.id !== id));
+      },
+
+      toggleTodo(id: number) {
+        setTodos(
+          todos.map(todo =>
+            todo.id === id ? { ...todo, completed: !todo.completed } : todo,
+          ),
+        );
+      },
+
+      renameTodo(id: number, title: string) {
+        setTodos(
+          todos.map(todo => (todo.id === id ? { ...todo, title } : todo)),
+        );
+      },
+
+      toggleAll() {
+        const allCompleted = todos.every(todo => todo.completed);
+
+        setTodos(todos.map(todo => ({ ...todo, completed: !allCompleted })));
+      },
+
+      clearCompleted() {
+        setTodos(todos.filter(todo => !todo.completed));
+      },
+    }),
+    [todos],
+  );
+
+  const filtredTodos = getFiltredTodos(todos, activeFilter);
+
+  const value: Context = useMemo(
+    () => ({
+      todos,
+      filtredTodos,
+      setTodos,
+      activeFilter,
+      setActiveFilter,
+    }),
+    [todos, filtredTodos, setTodos, activeFilter],
+  );
+
+  return (
+    <MethodsContext.Provider value={methods}>
+      <TodosContext.Provider value={value}>{children}</TodosContext.Provider>
+    </MethodsContext.Provider>
+  );
+};
diff --git a/src/hooks/useLocalStorage.ts b/src/hooks/useLocalStorage.ts
new file mode 100644
index 000000000..04fc40981
--- /dev/null
+++ b/src/hooks/useLocalStorage.ts
@@ -0,0 +1,33 @@
+import { useState } from 'react';
+
+export function useLocalStorage<T>(
+  valueName: string,
+  initialValue: T,
+): [T, (v: T) => void] {
+  const [value, setValue] = useState<T>(() => {
+    if (localStorage.getItem(valueName) === null) {
+      localStorage.setItem(valueName, JSON.stringify(initialValue));
+    }
+
+    const data = localStorage.getItem(valueName);
+
+    if (data === null) {
+      return initialValue;
+    }
+
+    try {
+      return JSON.parse(data);
+    } catch (error) {
+      localStorage.removeItem(valueName);
+
+      return initialValue;
+    }
+  });
+
+  const changeValue = (newValue: T) => {
+    localStorage.setItem(valueName, JSON.stringify(newValue));
+    setValue(newValue);
+  };
+
+  return [value, changeValue];
+}
diff --git a/src/index.tsx b/src/index.tsx
index a9689cb38..72f012c62 100644
--- a/src/index.tsx
+++ b/src/index.tsx
@@ -1,11 +1,17 @@
 import { createRoot } from 'react-dom/client';
 
-import './styles/index.css';
-import './styles/todo-list.css';
-import './styles/filters.css';
+import './styles/index.scss';
+import './styles/todoapp.scss';
+import './styles/todo.scss';
+import './styles/filter.scss';
 
 import { App } from './App';
+import { TodosProvider } from './components/TodosContext/TodosContext';
 
 const container = document.getElementById('root') as HTMLDivElement;
 
-createRoot(container).render(<App />);
+createRoot(container).render(
+  <TodosProvider>
+    <App />
+  </TodosProvider>,
+);
diff --git a/src/styles/todo.scss b/src/styles/todo.scss
index 4576af434..cfb34ec2f 100644
--- a/src/styles/todo.scss
+++ b/src/styles/todo.scss
@@ -71,6 +71,7 @@
   }
 
   &__title-field {
+    box-sizing: border-box;
     width: 100%;
     padding: 11px 14px;
 
diff --git a/src/styles/todoapp.scss b/src/styles/todoapp.scss
index e289a9458..29383a1e2 100644
--- a/src/styles/todoapp.scss
+++ b/src/styles/todoapp.scss
@@ -56,6 +56,7 @@
   }
 
   &__new-todo {
+    box-sizing: border-box;
     width: 100%;
     padding: 16px 16px 16px 60px;
 
diff --git a/src/types/Todo.ts b/src/types/Todo.ts
new file mode 100644
index 000000000..f9e06b381
--- /dev/null
+++ b/src/types/Todo.ts
@@ -0,0 +1,5 @@
+export interface Todo {
+  id: number;
+  title: string;
+  completed: boolean;
+}
diff --git a/src/types/TodoStatus.ts b/src/types/TodoStatus.ts
new file mode 100644
index 000000000..207c27648
--- /dev/null
+++ b/src/types/TodoStatus.ts
@@ -0,0 +1,5 @@
+export enum TodoStatus {
+  All = 'All',
+  Active = 'Active',
+  Completed = 'Completed',
+}
diff --git a/src/utils/countActiveTodo.ts b/src/utils/countActiveTodo.ts
new file mode 100644
index 000000000..752b45804
--- /dev/null
+++ b/src/utils/countActiveTodo.ts
@@ -0,0 +1,5 @@
+import { Todo } from '../types/Todo';
+
+export const countActiveTodo = (todos: Todo[]) => {
+  return todos.reduce((count, todo) => count + Number(!todo.completed), 0);
+};
diff --git a/src/utils/getFiltredTodos.ts b/src/utils/getFiltredTodos.ts
new file mode 100644
index 000000000..d94b36c27
--- /dev/null
+++ b/src/utils/getFiltredTodos.ts
@@ -0,0 +1,15 @@
+import { Todo } from '../types/Todo';
+import { TodoStatus } from '../types/TodoStatus';
+
+export const getFiltredTodos = (todos: Todo[], filter: TodoStatus) => {
+  switch (filter) {
+    case TodoStatus.Completed:
+      return todos.filter(todo => todo.completed);
+
+    case TodoStatus.Active:
+      return todos.filter(todo => !todo.completed);
+
+    default:
+      return todos;
+  }
+};