Best game design channel ever!
He explains everything so simply and short. Because he doesn't do this for money from youtube, he can just make 2-3 minutes long videos and get to the essence. Youtube rarely rarely recommend his videos even though I watched all of them because I guess they are not good for showing ads.
And he's THE real deal, not any journalist wanna be a game developer and makes a lot of videos about game dev. He made many many hit games and still doing it, a living legend. His materials and experience that he's sharing are invaluable.