I am a newbie on BB and while some of the things became clear from videos and the templates that BB2 includes in it, there are still many questions that remain unanswered and unclear. Recently 'Color Switch's bbdoc was shared on his youtube interview and that one file answered alot of my questions. Is there a repository of complete bbdoc of full games, specially those with multiworlds, multiple levels, algined scenes, and so forth that I can download and study to better understand BB?
I've not seen any for free, but I haven't exactly been looking. You can purchase game templates on Codecanyon, might be worth asking the creators if the templates come with multiple worlds and everything else you are looking for. There are also lots of tutorials on youtube which will allow you to build a game yourself as you follow