Unfortunately, to truly learn you have to either pay - usually by working for free/as an intern to a company that will teach you - or try until you get results.
The sources you touch while learning - any subject - are near infinite. There’s always something to learn.
Ofc, there’s also those who teach who have no business teaching wrong things. And unless they get flagged by others with knowledge, one would have no real way to know unless direct experience is involved.
There really isnt a one and all for character design / videogame character making. Each video/article you find can be great or horrible.
Geberally speaking, FlippedNormals content is decent.
Also, anything where you hear “without further ado” is something you can in all likelyhood thumb down and forget the existence of. Idk why exactly, but I think I’d remeber otherwise if any of those videos were ever worth the time to watch.
If you truly are interested in teaching yourself, anyway, the first step is always to crack an anatomy book if you don’t know your nomenclature and basic functionality.
This keeps you from doing rtard stuff like rotating a palm and complaining to people about the candy wrap effect it generates.
Of special note on youtubers, most of them will try to lick their own elbow for an hour after you tell them it is impossible to do so.
Learning from people like that usually means you aren’t learning anytning correct in any way shape or form.
You come to that realization with experience, mostly in other fields. And trial/error - after what you put together from 20 different sources fails to perform like you need it to miserably.
There are always reasons for it - the main one being nothing you ended up implementing was thought out in the least… but to think something out, you need enough knowledge. Thats why DIY with no team is a step process.
Make, test, trash, make again, etc. (Goes more for coding than for characters, though I myself am still playing with weightpaint 2 years down the line, so maybe it goes for that too 
)