Principled BSDF Shader Settings for Steel in Blender - Jigasu.Com
cycles render engine - How to use the Principled BSDF shader to create an old-paper-like material? - Blender Stack Exchange
Principled Volume — Blender Manual
Principled BSDF — Blender Manual
How to Use Blender's new ULTIMATE Shader: Principled — Blender Guru
Here's a free Principled BSDF Shader guide to help Blender users, an extract from the free PDF guide and YouTube tutorial below, hope you find it useful :D : r/learnblender