npm start will...start the localhost:3000 server.
There is some opinionated/standard stuff included for ESLint and Prettier. These are wired up to do some automatic things in VS Code via settings.json. For example, as soon as you leave the file it will auto save, format and even fix linting stuff for you. If that's too much, you may want to reconfigure it.
Finally, there are a few recommended extensions. You'll probably want these.
Hope it helps. Give it a ⭐, will ya? 🤓