Hey yall, finally trying to learn to play the guitar after talking about it for decades. Love GT so far as it can work with my irregular schedules. Went through fundamentals 1 and 2, but must admit I went pretty fast. Now trying to start the country module... first lesson talks about the B7 chord; now I saw and went through a lot of lessons about chords but didn't see a one that talked about chords with numbers following them. Where did I go wrong?