Checkout bigclivedotcom on youtube - he reverse engineers circuits all the time in entertaining and accessible ways; a great way to learn through practical applications.
Big Clive is is one of my favorite people but I feel like it would be pretty frustrating (and possibly even dangerous) to try to learn electronics from weatching random chinesium product teardowns.
Ha! It's true Big Clive is always testing dangerous things. I sometimes watch it when YouTube recommends it, and I take it as a lesson of things I shouldn't do. Also, I think it might help to notice badly engineering things in cheap (or not that cheap) products. And I like his hand-drawn diagrams.
