Watch the Number System online guitar lesson by Johnny Hiland from Ten Gallon Guitar: Intros, Outros & Turnarounds
The second thing that's really important is that you need to know the number system enough to know the layout of the song. For example, the layout of the song could be an "11-44-55-11". Well, what do I mean by that? It really bases itself off the major scale of whatever key the song is in. If the song is in the key of E, then you would base everything off the E major scale. Your 1 chord would be an E, your 4 chord would be an A, and your 5 chord would be a B. We'll walk through how to find these notes using the major scale in the video, as well as a way to play them that will help you remember these notes.