How to create First React App ?

 To create your first React application, you can use the `create-react-app` command-line tool. Here are the steps:

1. First, you need to have Node.js and npm installed on your system. If you haven't installed these yet, you can download them from Node.js — Run JavaScript Everywhere (nodejs.org)

2. Once Node.js and npm are installed, you can install `create-react-app` globally on your system using the following command:

npm install -g create-react-app

3. After `create-react-app` is installed, you can create a new React application using the following command:

npx create-react-app my-app

Replace `my-app` with the name you want for your application.

4. This will create a new directory with the name of your application, and it will set up the initial project structure and install the necessary dependencies.

5. To start the application, navigate into the application's directory and start the development server:

cd my-app

npm start

Your application will be available at `http://localhost:3000` in your web browser.