Creating a React.js App from Scratch: A Step-by-Step Guide

1. Install Node.js and npm (Node Package Manager) on your computer.

1. Use npm to install the Create React App command line tool globally with the following command:

npm install -g create-react-app

3. Create a new React.js project by running the following command in your terminal:

npx create-react-app my-app

4. Change into the newly created project directory:

cd my-app

5. Start the development server and run the application in the browser:

npm start

6. You can now modify the src directory to start building your React.js application.

That’s it! You now have a basic React.js application up and running.