Educational YouTube channels are my favorites, especially because I homeschool as much as I can.
YouTube creators who are able to teach things to any age in a way that is entertaining, funny, or otherwise outside of the normal institutional style of learning are especially prized.
Simone Giertz (a.k.a. "The Queen of Shitty Robots") is another favorite.
Simone is famous for building robots to do menial tasks around her house (or boat). Most of her designs are built on the Arduino platform of microcontrollers .
Most of her videos are very funny and inspiring. Her life story is quite impressive as well.