Robert Sapolsky's course on Biology of Human Behaviour (Stanford) - https://www.youtube.com/playlist?list=PL150326949691B199
Every Frame A Painting - understanding movies - https://www.youtube.com/user/everyframeapainting/videos
Captain Disillusion - debunking fake videos/understanding video effects - https://www.youtube.com/user/CaptainDisillusion/videos
Maths-related: Gilbert Strang
Science-related: Feynman
Hamming's The Art of Doing Science and Engineering: Learning to Learn course - https://www.youtube.com/playlist?list=PL2FF649D0C4407B30