When I joined I started with Lisa McCormick's Guitar Basics courses. I've been playing for years (lots of noodling as well) but no matter how much you might already know, those two courses are solid gold. She definitely has complete command of the instrument and a knack for teaching which is in itself a rare thing to find as a student.

Like you I feel like through the years I missed a few basics that are holding me back. So far GT is helping me fill in those blanks. Good luck!