The colour wheel confuses me. I've read a few tutorials on it, and I still don't get it.
FAQ's about batting - types, loft, what kind is best for what kind of project, what kind is best for machine vs hand quilting.
Jargon list - when I decided to make a quilt, I had a friend ask me if I was piecing or quilting right now...huh? Piecing what now? I hadn't even cut my fabric yet. lol
I spent a lot of time trying to understand the difference between straight vs bias binding, and which I should use.
Hmm...if I think of any more, I'll add them...