In order to use bootstrap in React Js, you will need to first install the npm bootstrap package. You will also need to install the react supported bootstrap package.
Step 1: Install bootstrap and react-bootstrap
npm install react-bootstrap bootstrap
Step 2: Import components in code
import Button from 'react-bootstrap/Button';
Step 3: Import bootstrap styles / css
import 'bootstrap/dist/css/bootstrap.min.css';
Step 4: Use imported component
<Button variant="primary">Primary</Button>
Use this guide to learn about components – React-Bootstrap Components.