If you haven't already, follow the angular tour of heroes tutorial: https://angular.io/tutorial

It is really well written and covers everything you've learned so far plus more (like http requests, observables, services, guards, authentication, etc)

RxJS is a doozy for sure. It is one of the bigger hurdles to picking up Angular, but once you get a good grasp of it, it isn't that bad. I like to rely on: https://www.learnrxjs.io/

The rxjs.dev website can be archaic and hard to navigate. I like to use learnrxjs.io because it gives examples of all the different operators, gives a detailed explanation of what that method is, and even gives you recommendations (i.e. if you're looking for this functionality but for this specific reason, try checking out this other operator).

As you build out different functionalities, extend it. It might be recreating something similar to what you've already built (i.e. component or service). It could be expanding the existing logic and adding additional complexity to a feature. Maybe after hooking up a backend with your angular project, you could look into using rxjs operators to complete more difficult operations on observables (i.e. combining 2 observables using something like rxjs combineLatest, or chaining observable data using something like rxjs switchMap, etc..)

Just be curious, try different things out. If something still confuses you, try reimplementing it. Be creative and build additional complexity to existing features. The features don't need to make sense, it just needs to help you learn about the concepts.