What are the things need to learn to write a Shader code?

Question

For someone with no background about Graphics Design, how should anyone start learning GLSL? I started seeing Shadertoy code but don't understand the variables and syntaxes.

score -1 · Accepted Answer · answered Apr 02 '19 at 20:16

I suggest looking at a resource like https://learnopengl.com/. This website a ton of comprehensive modern OpenGL tutorials and goes into depth about GLSL shaders in a few of them. ShaderToy shader code works a bit differently than normal graphics applications and is explained nicely in this question's answer:

WebGL/GLSL - How does a ShaderToy work?

What are the things need to learn to write a Shader code?

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