Comment by RedlineTriad

Some of my favorites are:

Acerola, GPU and shader programming: https://www.youtube.com/@Acerola_t

Sebastian Lague, various mostly visual algorithms for games: https://www.youtube.com/@SebastianLague

Freya Holmér, beautiful game dev related math: https://www.youtube.com/@acegikmo

pannenkoek2012, how Mario 64 limitations create the most interesting bugs: https://www.youtube.com/@pannenkoek2012

Jon Gjengset, some of the most in-depth rust content: https://www.youtube.com/@jonhoo

AngeTheGreat, physics engine game dev including sound simulation: https://www.youtube.com/@AngeTheGreat

fasterthanlime, diverse, mostly rust content: https://www.youtube.com/@fasterthanlime

Bisqwit, retro programming: https://www.youtube.com/@Bisqwit

CodeParade, higher dimensional and fractal game dev: https://www.youtube.com/@CodeParade

suckerpinch, code that should not be though of, let alone executed: https://www.youtube.com/@tom7

SimonDev, game dev, performance focused, video quality varies: https://www.youtube.com/@simondev758

And many mentioned by SilverCode