Create new project

              npx create-react-app my-app

              or

              yarn create react-app my-app

            

            cd my-app
            

            npm run start 

            or 

            yarn run start

            

Bootstrap

            npm install bootstrap

            or

            yarn add bootstrap

          

Adding Bootstrap files in a React App

/src/index.js

          import "bootstrap/dist/css/bootstrap.min.css";
          import "bootstrap/dist/js/bootstrap.bundle.min";
          

in app.js

          import "./App.css";