For the next step, just make sure to add your new Sass file into the top of your App.js with import './main.scss. When you run your React app with npm run start, you should see your beautiful sass changes appear onto the screen!
I hope you found this helpful! I'm going to try and create more technical content this year to strengthen my writing and creativity skills so hopefully I can make cooler guides like this in the future!
PS: If you find ANYTHING wrong with the code or implementation above, let me know! I'm happy to make sure people are learning the correct things from my posts :)