Some very basic shader tutorials?

Unity Shader Programming: Beginners to Advanced Techniques

Optifine HD Mod 1.20, 1.19.4 → 1.18.2 (FPS Boost & Shaders Support) — Shaders Mods

Complementary Shaders 1.20, 1.19.4 → 1.18.2 (BSL Edit) — Shaders Mods

Complementary Unbound Shaders 1.21 / 1.20 | Shader Pack for Minecraft

ShaderGraph: Color - Unity Learn

Shader Forge - A visual, node-based shader editor

Shader Forge - A visual, node-based shader editor