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
Principled BSDF Shader Settings for Steel in Blender - Jigasu.Com
shaders - Where/How does the Principled BSDF incorporate Fresnel? - Blender Stack Exchange
How to Use Blender's new ULTIMATE Shader: Principled — Blender Guru
How Do I Create A Car Shader In Blender? - 3D World | Scribd
Principled BSDF for Physically-Based Rendering in Blender
texturing - Principled BSDF node not shading right - Blender Stack Exchange
is there a way to add an ambient occlusion map to a Principled bsdf? : r/ blender