I started to learn shader programing for WebGL, but I am facing issues while learning it

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I started to learn it from the book of shaders, but there are lots of concepts I am not getting it like: What is inside u_resolution and why the sometimes they are using maths functions. I forgot lots of math, I also need to learn necessary maths for it

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Maybe simple examples will help you?

From the Collection of examples from discourse.threejs.org

see Little Shader Book

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This resource is good for pure shader development but not for WebGL in general. Beginners should start with a respective WebGL book (just google the topic). For three.js specific resources, have a look at the Resources section at the homepage.

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thank you so much for your reply.
I checked the Resources section but didn’t find any specific section for shaders.
I don’t want to learn WebGL, I learn three.js and want to use shaders inside it.
can you please suggest me resource to learn shader programming?(I am trying to learn it from 3 days).
I searched for webGL but didn’t found good resources.

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thanks for your reply, I’ll check it