Best YouTube Chess.

Gothamchess
Worthless for intermediate and advanced. Dubious for beginners. Entertaining, though. Gotham is smart, sometimes funny, always interesting, and a strong player. He might be a good teacher, too, but online he emphasizes the entertainment side of his chess advice.

I’m an intermediate player and am finding Eric Rosen’s speed run instructive.
Some St. Louis Chess Club lectures are very good, but these tend to be pitched toward those rated substantially lower.
Kingcrusher’s videos have been instructive to me for 15 years. He’s also a terrific guy with whom I got to play some blitz when I was in London.