As I've gotten pretty good at digital art, I've of course run into a ton of these video thumbnails saying "stop doing this/don't make this mistake/this is WRONG" And I take issue with them. It's for one of two reasons.
1: their "correct" example doesn't really look any good either from an anatomy or compositional lens, or more likely..
2: what they define as a mistake is a minute personal preference they frame as inherently, factually "incorrect" but it's often not a bad practice. It's just that there are a million different styles and workflows that contradict each other in how the different artists obtain their very specific style.
My advice:
Learn basic anatomy or the fundamentals of whatever you're drawing and use various references from different artists you admire.. BUT THE GOLDEN RULE IS THIS: If you draw it and it looks good to you: IT'S DONE. IT'S GOOD. THAT'S AN ART. SHARE IT WITH THE WORLD.
I fear that new artists will.. Let's say, see how someone doesn't personally like to shade something that might be a good method for their personal style, but then never do it because they're told it's WRONG. EVENTUALLY THIS LEADS TO A TON OF CONFLICTING INFORMATION FROM DIFFERENT SOURCES.
Tl;Dr if you like what you made, you drew it correctly