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

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

Shader Effects - Color Theory - Awwwards

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