Probably not correct wording, I refer here the fantastic science/scientific content of Youtube. Since its conception I’m a big fan of scientific contents of Youtube, and no fan of the ads bloating content recently…
Here are some excellent contents that I like to watch and try to follow (there are many-many more but these were the most influential to me over the past decade):
Maths:
Physics:
Independent but equals academia Perimeter Institute
Programming:
A very nice intro to programming and creativity by Daniel Shiffman: