How does the node editor work?

How does the node editor work? There no tutirivals on it.

Really? I just googled ‘blender node editor tutorials’ and there were literally loads of ‘beginners’ guides.

Here’s one just picked at random: (if you like to read tutorials)

Here’s another: (if you prefer videos - this is for Blender 2.79 - but the principles are the same)

And there are many more. I’d have a good look round and then come back with any detailed questions you might have about individual nodes or problems you encounter. Your original question is a bit wide ranging.

Thank you!
I donthink think I looked properly. Lol

it’s called Shader Editor since 2.8 though