If you are not doing any native modules by yourself, developing for Android is not that much different from developing for iOS. That's kinda the point of react-native :)
Many resources out there have examples in iOS because running on an iOS simulator is easier than running on Android simulator (which is slow as a crawl, and even did freeze my MBP a couple of times) and definitely easier than getting an Android device to run on.
However, much of what these resources show applies as much to Android as it does to iOS, so you shouldn't feel pressured into finding "Android specific" RN resources — make use of what you have!
It looks to me what you're asking, though, is more along the lines of "How do I learn RN best". Learning can be fun, but it can also be daunting and you can feel like you don't know where to go next, or even what to do now. So this is my advice about learning in general:
Relying on tutorials too much will only get in the way of learning. Instead, go through the official docs and the official tutorial, maybe follow a tutorial or two, but then, instead of finding a tutorial for everything, pause.
Following tutorials is good to get an initial idea, but terrible for retaining knowledge. Practice, on the other hand, helps you solidify the concepts and knowledge in your brain. Come up with a learning project, and go about making it.
You might encounter things that you don't know yet—and it's perfectly fine. Searching and reading about things in the context of a specific problem likewise does wonders to understanding.