Some very basic shader tutorials?

Unity Shader Programming: Beginners to Advanced Techniques

Shader Development using Unity

Complementary Unbound Shaders 1.21 / 1.20 | Shader Pack for Minecraft

Minecraft 1.16.5 Shaders | Shader Packs

Shader Effects - Color Theory - Awwwards

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