Is it? All the fundamentals are tied to how it's done in OpenGL with somewhat sparse explanations in between. And many "fundamentals" are literally something like
#version 330 core
struct Material {https://learnopengl.com/PBR/Lighting
Even the code snippets start with "#version 330", if you implement these in another tech stack (say vulkan+slang) the relevant shader code would look very similar. It's quite strange to me that you think just because of "#version 330" it's not about fundamentals, tbh.
Another link floated to the top of HN discussion just now, and every sibgle link there is better than these "fundamentals": https://news.ycombinator.com/item?id=49022038 E.g. "Computer Graphics from Scratch" https://gabrielgambetta.com/computer-graphics-from-scratch/ or Mathematics for Computer Graphics https://www.amazon.co.uk/Mathematics-Computer-Graphics-John-...
#version 450
struct Material {
Despite the name, GLSL is still used all over the place in Vulkan pipelines. The site teaches you the shader approach (rather than the fixed function pipeline of the 90s) which is what the "modern" Vulkan stack uses too.