Create React App doesn't prescribe a specific routing solution, but React Router is the most popular one.
To add it, run:
npm install --save react-router-dom
Alternatively you may use
yarn add react-router-dom
To try it, delete all the code in
src/App.js and replace it with any of the examples on its website. The Basic Example is a good place to get started.
Note that you may need to configure your production server to support client-side routing before deploying your app.