I had some weird problems like that too. Just continue through the course. It shows you how to do color ramps with it. You can even add in a few math nodes if necessary.
Also, did you already do the subdivisions on your mesh?
Yup, I read the questions and answers too but wasn't sure if I had the same issue, I suppose I won't know unless I try.
OK I altered some of the mesh and messed up the UV map so I have to do this again bear with.
