add bootstrap to react,.........,,,,

                                    	import $ from 'jquery';
	import Popper from 'popper.js';
	import 'bootstrap/dist/js/bootstrap.bundle.min';

                                    //1.run following commnad in cmd:
npm install bootstrap --save
//you can now use bootstrap component. example:
import { Button } from 'react-bootstrap';

//2.or  add this to index.js:
<link
  rel="stylesheet"
  href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css"
  integrity="sha384-B0vP5xmATw1+K9KRQjQERJvTumQW0nPEzvF6L/Z6nronJ3oUOFUFpCjEUQouq2+l"
  crossorigin="anonymous"
/>

                                    	npm install bootstrap

                                    npm install --save bootstrapCopy

                                         1. install react-bootstrap

                npm install react-bootstrap bootstrap


     2. import css file in your index.js or app.js

                import 'bootstrap/dist/css/bootstrap.min.css';

             <link
              rel="stylesheet"
              href="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css"
              integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T"
              crossorigin="anonymous"
             />

      3. import components like

                import { Button } from 'react-bootstrap';