Setup react app

Using npx

npx create-react-app react-demo

npx command only works with npm version5.2+ and higher

Using npm

npm init react-app react-demo

npm init command is available in npm 6+

Using yarn

yarn create react-app react-demo

yarn create command is available in Yarn 0.25+

Result

Running of above command generate react-demo folder. it will generate self understandable folder structure like below screenshot.

Scripts

npm start OR yarn start will open development server, you can access via http://localhost:3000 on browser.

npm run build OR yarn build generate the build of project to build folder.

Now you are ready to deploy.