This is a very good channel for beginner to intermediate level players who
wants to get better. When John streams, he usually explains his reasoning for
moves and they are pretty instructive.
This is a great channel to just enjoy both modern and older classic chess games.
Grandmaster Hikaru Nakamura's channel is a pretty active one since he streams
Blitz chess pretty regularly. Follow it to see a Chess tactical genius at work!
However, Blitz at that level is a very poor format for actual learning because
things happen too quickly for beginner or even intermediate level players at
Matthew Sadler's videos on AlphaZero play against Stockfish in chess24
network's YouTube channel are very interesting due to AlphaZero's novelties in
very well studied positions to outplay traditional engines like Stockfish. One
good example of innovative, almost alien play by AlphaZero is
Chess.com - Probably has the biggest chess playing audience. Their paid
offerings seem to be pretty good value if you are serious about improving.
Chessbase - I'm a little disappointed that Chessbase does not have an offering
for Linux or macOS users.