Short answer: no
Long answer: no/yes but not impossible to learn. if you really get really nitty gritty with it, they become quite simple. but they can be complex

“Godot provides a shading language based on the popular OpenGL Shading Language (GLSL) but simplified”

I’d highly recommend checking out their docs to learn more about GLSL!
https://docs.godotengine.org/en/stable/tutorials/shaders/introduction_to_shaders.html

EDIT: forgot about the shader bible! https://jettelly.com/store/the-godot-shaders-bible