Node Materials for Beginners

I just started with Babylon.

I am trying to work with the node editor for materials but all the tutorials start with a node setup already completed.
I have a simple scene I am building, and I made a floor using a primitive plane.
I am trying to colour the floor using nodes, but all I could do was creating a colour node. I don’t understand where I can find the viewer node or instructions on how to set it up…

The scene I am creating is

Does anyone know a good tutorial or could give me a hand to start to learn it?

I’m trying to find a tutorial that guides you from the declaration of the node material in the editor to a blanc node editor to the creation of the node structure…
Thank you!!!

It is all in the documentation: Node Material | Babylon.js Documentation with videos coming with it as you are more of a visual learner