Gumroad – The Hard Surface Handbook (For Blender)

https://gumroad.com/l/OmOJF

The Hard-Surface Handbook was created to assist with the understanding of the various topics in hard-surface modeling. There are so many different important topics in hard-surface modeling, from auto smooth, bevel weight, booleans, ngons, shading, etc, and this handbook is meant to cover each and every one of those topics in-depth.