We'll use this code as a starting point for exploring how to use Redux to maintain centralized application state. The first time you run this app, make sure to run npm install first, to install needed dependencies. Then, to run the app and see it in your browser, you can run
npm start
This will run the app in the development mode, and it should automatically open http://localhost:3000 to view the app in your browser (though you can manually open that URL in your browser, too). The app is set up so that the page will reload if you make edits to the code. You will also see any lint errors in the console.