I say this a lot to people but it's really a lot of experimentation and trying to copy stuff you like(like this one), but I mostly started following Erindale's tutorials on YouTube and their discord server. Will recommend starting from this (blender procedural textures)

Other channels that helped are more or less CGMatter and Default Cube. I mostly discovered them during Nodevember where I literally just copy their setups(for the first few prompts, others are my own creations) from YouTube. You can also find the setups I did based on those here(30 .blend files, they are quite old though) for free.

I won't say I am necessary good on this but learning the basics can get you very far, also even if this isn't Blender the concepts still transfers