Some very basic shader tutorials?

Unity Shader Programming: Beginners to Advanced Techniques

Shader Development using Unity

How to create a shader in Shader Graph that masks out the intersection of other objects?

[RELEASED] Shader Toolbox for URP - Ready-to-use graphs, subgraphs, and Renderer Features

Shader Effects - Color Theory - Awwwards

[Released] 2D Effects Creator - Node-Based 2D Shader Effect Creation Tool