Design tutorials?

Hi
I’m searching for good tutorials about design.
Payed or free.
3D stuff of course, but specifically more about design than about the technical aspects.
First I want to gather a bunch so it doesn’t matter if its about characters, objects or architecture. Everything would be interesting.
This one for example was very good https://www.youtube.com/watch?v=YWSRnuvaTXk
I’m also very interested in whole curses about such things.

Flipped Normals seems to be a very good resource in the world of characters.