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 w

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.