I'm working on CG geeks forest road tut. The final render is black and It's a mat problem not a lighting thing like I just thought. In textured view it looks fine. I've attached screenshots. what have I messed up?
According to your screenshot, you don't have an output node in your material:
Add one by going to the node editor.
To get the nod editor, either press F3 while hovering over an area which you want to make a node editor, or by selecting the area type from the dropdown in the header:
Then press ⇧ ShiftA> Output > Material output to add an output node:
Connect the output of your shader to the surface input of the output node: