Mobile-first design with Angular, Express, and Node

I did this challenge because I wanted to try taking a crack at Angular. I still have a preference for using React but maybe I just need more experience with Angular. Either way, had a lot of fun learning this! My main confusion lies in app.module.ts where there are a bunch of module imports there from the generated project. I'd like to ask what these modules are for and how to utilize them?

I'd be more than happy to receive any feedback and/or comments for best practices with Angular as I'm not sure what they are yet. Cheers🎉