Ive noticed that the quality of individual creators on youtube is typically better (more entertaining & higher quality) than a lot of the videos teachers share as supplementary material in my kids school.
For example, veritassium does some very easy to understand science and maths videos, periodic videos is a entertaining way to run through the periodic table and then a bunch of others for history depending on the period. Also mystery doug of course for younger kids.
Does anyone have any favorites they have stumbled across?