For anyone who wants to learn shaders in Godot I wholeheartedly recommend a relatively new video (two months ago) by Christian Koch (youtube channel ‘Clear Code’). The video is called ‘The ultimate introduction to shaders in Godot’.
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fwiw, I bought the book and have now worked through most of it. I find it helpful.
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Is there are reason you don’t want to just link the video?
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would you recommend it to a total beginner of shaders? I have never written one.
Yes, I have also never written one 
It’s clear enough for beginners. You can try it yourself, the first parts of the first few chapters are free.
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I’d recommend that beginners start with the free “The Book of Shaders” — it’ll give you a general idea. In general, it’s better to start with something free (well, unless you have a lot of spare cash).
I tried porting some of it over to Godot, but since it didn’t get any response, I gave up on it.
Since I did that, they’ve changed the formatting, and the code layout has gone haywire.
https://www.patreon.com/posts/how-to-rotate-91037820
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TBH I found it rather dense and difficult to get into. I ended up learning by watching videos of old Godot 3 shaders and converting them to Godot 4 Visual Shaders.