Some very basic shader tutorials?

Unity Shader Programming: Beginners to Advanced Techniques

Shader Development using Unity

Chocapic13’s Shaders 1.20, 1.19.4 → 1.18.2 (High-Quality & Performance) — Shaders Mods

Chocapic13' Shaders Shaders for Minecraft [1.16.5][1.15.2][1.14.4][1.13.2][1.12.2][1.10.2]

[1.14] Chocapic13's Shaders - Minecraft Mods - Mapping and Modding: Java Edition - Minecraft Forum - Minecraft Forum

Shader Effects - Color Theory - Awwwards

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