Principled BSDF for Physically-Based Rendering in Blender
Integrating height information into Principled BSDF for easy layer mixing? - Materials and Textures - Blender Artists Community
When NOT to Use the Principled Shader in Blender - YouTube
cycles render engine - Can't get SSS to work with Principled BSDF shader - Blender Stack Exchange
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
How to Use Blender's new ULTIMATE Shader: Principled — Blender Guru
Help rotating in principled BSDF : r/blenderhelp
node editor - Add two Principled BSDF with alpha - Blender Stack Exchange