This Great Course Lecture series covers the religion by considering the historical context of the faith. (I'm not even sure if "faith" is the correct word to use in this context since as a whole Buddhist don't seem to believe in pretending to know things they don't know). I'm not sure if there is a source for what I want regarding learning about the tenets of Buddhism. As the lecturer said one of the early beliefs for Buddhism is all things are impermanent and that includes Buddhism itself. Well, I'll still be on the look out for a book on the subject to read in order to understand a little bit more about Buddhism.