BBEdit isn't just a program, it is a way of life. Certainly that is the
sense that you get from the legion of people that swear by it. If you are a new initiate to the cult of BBEdit perhaps
BBEdit Gems is just what you have been looking for.
BBEdit Gems is a site completely devoted to covering the ins and outs of BBEdit and tips and tricks to get the most out of this text editor.
As an aside, BBEdit Lite, the non-trial stripped-down free version, is no longer developed but still available and works on 10.4.4 (PowerPC) with no problems.