There are more android courses in the android library than there are in the android development track...confused!!!

So I am going to begin the java track then the android track. But I noticed that there are more java courses in the java library than there are in the learn java track. Same with android. Now why is this a problem you may ask? Well, these tracks are basically guiding you step-by-step, but not all the courses are in these tracks. So once I complete these tracks, how would I know which courses to start next(that weren't on the track). Because there are so many more intermediate and advanced(I think) courses on android and java in the library than there are in the tracks. So how would I know where to start if there won't be a track guiding me?? For example: these are the courses in the android development track: build a simple android app, build an interactive story app, build a weather, android list and adapters, and lastly android activity lifecycle(only 5 as you can see). And these are all beginner courses and the ONLY courses in the android development track. But once you go to the library and choose android as a topic, there are soo many android courses that aren't even on the android development track, in total there are nearly 23 courses on Android from beginner to intermediate, on treehouse. Which is GREAT!! But because most of these courses aren't in the android development track, it's a bit confusing to figure out which courses I should learn next to further my knowledge and learn more about android(or any language for that matter). Because a track guides you step-by-step as I've mentioned already. Hope this makes sense, please give me advice, and thank you for taking the time to read my question(s)! :)