I'm having a hard time trying to figure out, which types of nodes were used in the creation of a shader/material in the node editor. I did download a Blend file from the web and was curious to analyze the shaders and nodes, but when I open the Node Editor I can only see the custom names of most nodes, and not their "type", which I would need to reconstruct and explore. For example: I got a , which outputs a Factor and has a Texture, Thickness and Indentation. But I cant really figure out, which node this actually is. Any help would be much appreciated!
This seems to be a Node Group.
It is not a node by itself - rather a kind of a directory/folder.
It contains a node tree, with different inputs and outputs.
To enter or leave it press ⇥ Tab or the little top right arrow
It is used to organize complex node trees, or sharing node trees across materials.
You can also rename your group, or the nodes inside of it - so it's easier to navigate.
Node Groups Page in Blender Manual
I think the question applies even if the nodes are not in a group. I think the question is about how to know which node the user needs to create (for example an IMAGE TEXTURE, or a NORMAL MAP), based on a existing shader setup.
To know a node type, in Blender 2.92, just press N in the SHADER EDITOR, and in the SIDEBAR, the node original name (or the node type) will be there.