almost none of them will teach you anything. EEVblog has some educational content, and sparkfun covers the very basics. The others are purely entertainment and trivia for the already initiated. IMO.

I will disagree.

As a newbie hardware designer I learned a lot going through some of those resources. Especially repair videos tend to show a lot of tricks I would have to spend a lifetime to learn by myself. Once you learn the basics (it is easy) it gets more and more difficult to find really usefull information. Especially if you are a hobbyist and don't do it as your permanent job where you would typically have other nad hopefully more experienced engineers at hand.

not true. https://www.youtube.com/user/greatscottlab is a great resource of electronics education.