React.js

 To create a new React app, you can use the create-react-app command line tool.

First, make sure you have Node.js and npm (Node Package Manager) installed on your computer. You can download them from the official website if you don't already have them.

Then, open a terminal or command prompt and run the following command:

npx create-react-app my-app

This will create a new directory called "my-app" with the basic file structure for a React app. You can change "my-app" to any name you like for your app.

Then navigate to the app directory:

cd my-app

Then start the development server:

npm start

This command starts the development server and opens a browser window with the app running on http://localhost:3000/.

Now you can start building your React app!

What is components in react?

In React, a component is a piece of code that represents a part of a user interface. It can be reusable and can receive input (props) and manage its own state. Components are the building blocks of a React application and are used to create the UI. They can be simple, like a button, or more complex, like a form or a navigation menu. The component renders a view based on its props and state and can also handle events, such as user input.