Shadertoy for absolute beginners

This is the first in a series of ShaderToy tutorials, teaching you how to make shaders, starting with zero knowledge.
In this first installment we'll make a circle, which is what I would consider the 'Hello World' of ShaderToying.

Next Part:
https://www.youtube.com/watch?v=GgGBR4z8C9o
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Видео Shadertoy for absolute beginners канала The Art of Code