Videos
Here's some channels I watch a lot, mostly STEM/educational stuff. More to come...
MIT OpenCourseWare
Probably the best source for free online STEM lectures.
Watch ->Stanford
Great psych and business lectures.
Watch ->3b1b
Captivating math videos, a big reason I got intersted in math.
Watch ->AlphaPhoenix
Really well demonstrated/explained "practical" physics.
Watch ->Steve Brunton
Great videos on dynamical systems, control theory, compressed sensing, etc.
Watch ->Physics Explained
Understandable videos on advanced physics topics.
Watch ->Huygens Optics
Fascinating videos on experimental optics/photonics.
Watch ->