I've been using vi for 15+ years and full-time for development for about a year. There were at least 3 of these that I wasn't aware of which I will now commit to memory.

Certainly a beginner could learn this stuff right away, but I wouldn't consider it inherently beginner-oriented. Personally I don't think one canonical tutorial or reference is as effective as a large number of articles focused on things that different individuals find useful. Vim is just too big to absorb through one gargantuan tutorial.