For now the best thing I could do was provide a bunch of examples, and add more specific explanations to the nodes I deemed most confusing.
Giving a full manual page for all 187 nodes by hand would be too long so I decided to give a reference and only explain the ones I would get complaints about.
I want to make a video going over the tool and all of its nodes at some point, but for now the best way to learn is to just mess around with it. Of course, some shader knowledge is required, but there are many lessons made for the Unity, Unreal or Blender shader/material graphs that should give you learnings that transfer over quite well to this tool.
My hope is to catch the eye of more and more people and to eventually work with people in the community to make the tool more accessible as I can't do all of it on my own :)