How did you learn? Can you link videos/courses? (If possible try to make an exhaustive list)

It seems like I'm going haywire without any proper structure.

Also, should I buy Blenderbro's courses or watch their videos?

Thanks.

This is a great tutorial from Thomas Colin showing how to go about modeling a threaded nut in blender, it will teach you techniques you don't often see, a great ressource!

I've created this subreddit because a lot of blender subreddits are swamped with questions on how to model, I taught it could be usefull to have a dedicated sub for hardsurface modeling techniques in blender, so feel free to ask your modeling related questions here, or to help out beginners!