Know where your code is running...

The difference between client and server
React is a client side library first
- There are ways to run it on a server like with Next.js
- Most of the time your React code is running on the Client (Web Browser)
Environment Variables
- .env
  - In client side code is used for configuration
    - Prevents hard coding things
    - Prevents committing certain things to git
      - With .gitignore
    - NOT for hiding secrets