See Create React App if you're unfamiliar.
Runs the app in the development mode.
Open http://localhost:3000 to view it in the browser.
The page will reload if you make edits.
You will also see any lint errors in the console.
If you're having trouble building the project, you may need to run
npm rebuild node-sass. Generally, you should be able to find a helpful error message if something blows up.
npm run lint:styles
.sass-lint.yml to lint styles.