To create a React application, you will need to have Node.js and the create-react-app tool installed on your computer.

To install Node.js, go to the Node.js website (https://nodejs.org/) and download and install the latest version of Node.js for your operating system. This will also install the Node Package Manager (npm), which is used to install and manage packages (libraries and tools) in Node.js.

To install the create-react-app tool, open a terminal or command prompt and run the following command:

npm install -g create-react-app

This will install the create-react-app tool globally on your computer, allowing you to use it to create React applications from any directory.

Once the create-react-app tool is installed, you can create a new React application by running the following command:

create-react-app my-app

Replace my-app with the name of your application. This will create a new directory with the name of your application and generate the necessary files and directories for a basic React application.

To start the development server and view the application in your web browser, navigate to the directory of your application and run the following command:

cd my-app
npm start

This will start the development server and open the application in your default web browser. The development server will automatically reload the application whenever you make changes to the code, so you can see your changes in real-time as you develop your application.