Is there any outside training resource for learning BIAB? I have looked but only found a couple short basic courses on the basics.

I am looking for something more step by step to take me from the beginning to master. Every year there's a bunch of new features and a video that explains them. Great if you are already familiar with the program. But for someone who hasn't kept up from the beginning not so great.

And there's so much to learn about that I'd feel better with a comprehensive approach.

And the PG music tutorials are good but not in a sequence, building on what was previously learned.