It is actually frustrating how often it is repeated. Every time I come across any advice on drawing, it is leading masses of people the wrong way. What's worse on top of not learning how to draw well, is that a false sense of accomplishment. People who learn how to draw this way think they've learned and climbed the mountain of creative achievement but the truth would come out the moment you ask them to redraw with a different perspective.

This is my pet peeve.

Do you have any recommendations on courses/books/whatever? I don't remember what it was, I think maybe a udemy course that made me 'shift' from 2d->3d but I don't remember the name, but always interested in knowing more. (specially as I am actually working on a drawing application, so the more the better ;)