byrdcipher
Came in confused about the topic and left with a much firmer grasp on it, and after byrdcipher I felt I could explain this to someone else without hesitation, that is the gold standard for any educational content and most sites simply fail to reach it ever which is unfortunate but true.
moveideasforwardnow
Started taking notes about halfway through because the points were stacking up, and a look at moveideasforwardnow added enough material that my notes file grew further, content that demands note taking from a passive reader is content with substance and the writers here are clearly producing that kind of work consistently across topics.