Great post that I often go back on. A curious fact about Karpathy is that he actually has a long history of teaching (relative to his age). About 9 years ago, I learned how to speed solve Rubik's cubes in ~12 seconds through his YouTube channel [0]. It's interesting to see that his simple teaching style transfers quite well to more technical topics than twisty puzzles.
[0] https://www.youtube.com/user/badmephisto