Create React App

Create React App is an officially supported way to create React applications. 

npx

All you need to do to create a new React app is run the npx command. You say npx create-react-app app-name. The app-name that you want your app to have.

npx downloads the lastest version of create-react-app templates.

Note: npx comes with npm 5.2 and higher.

I’m going to go terminal and run the “npx create-react-app first-react-app”.

npm

npm init react-app first-react-app

yarn

yarn create react-app first-react-app

Inside the newly created project, you can run some built-in commands:

npm start or yarn start

Then open http://localhost:3000/ to see your app.

Summary

npx create-react-app my-app
cd my-app
npm start