Cyan ✨ on Twitter: "Been looking into custom lighting for Universal RP (v7.2.1+) & #shadergraph (see thread) https://t.co/dtanaaHoD8 This article is pretty good, but the Unlit Master won't receive shadows - unless
Unity - Manual: Surface Shader lighting examples
Kyle Halladay - Writing Shaders for Deferred Lighting in Unity3D
Writing Our Own Diffuse Lighting Shader - YouTube
Physically Based Rendering: PBR in Unity - Shader tutorial