This video explains the basic principles of adding Maxwell materials from online sources and how to properly map / tile them to 3D objects so they have the correct appearance.
Organizing your model for materials - 0:00
Import materials + apply - 1:00
Basic material properties - 4:25
Texture mapping - 6:33
Apply mapping + adjust tiling - 9:00
Adjust mapping widget (scale, rotate, move) - 12:15
Explode and control individual surface mapping - 14:00
Demonstration of mapping concrete - 17:30
Change material path - 24:00
More material examples - 27:00