Vivek Agrawal It might sound basic, but the official documentation really goes a long way. It might be a little bit dry to read, but if you are interested in getting deep into it, it is a gold mine.
I will continue making digestible (and illustrated) tutorials over the coming weeks, and I'll go as deep as necessary to be a competent user. I also plan to make some side-note articles where I try to explain to the best of my capabilities some of the more low-level concepts, but the main focus of this series is accessibility!