Hey Friend,
Let's move this along.
We covered a lot of ground with the key of C major. Seven chords (plus some variations), in upwards of ten versions for each. Many shapes you can use to work your magic around the guitar neck.
But that was just one key. There are twelve major keys (and twelve minor).
So where to next? I suppose we could go sequentially to the next key - D major - but what fun would that be? Since you're going to hear about this soon enough (if you haven't already), we're going to follow the path of The Circle of Fifths. Sound's like something you might encounter in a Tolkein book, right? You now, the guy that wrote The Lord of The Rings Trilogy and The Hobbit? Maybe you're more of a Harry Potter fan...
One of the reasons to start learning chords with the key of C major is because there are no accidental notes (sharps or flats) in the key. Each note is a natural note, and that makes it easier to learn when starting out.
The Circle of Fifths is a tool that helps you determine the number of sharps or flats a key happens to have. That's not all it does, but for our needs today, that's all we need.
Let's determine which key is next on our journey to learning guitar chords.
Start at the top of the Circle, where C major is perched. As we've already discussed, C major has no sharps of flats. Working clockwise, our next stop at the 1 o'clock position is G major. As you see from the diagram, G major has one sharp note in it. But how did we get there?
I use a pretty simple technique to figure it out. What I do is just count up from the key I'm moving up from. For example, since we started on C major, I just count up five notes from there. I know that since C major had zero sharps, the next key will have one. Here's how it looks:
C major = 0 sharps
1 2 3 4 5 C D E F G
G major = 1 sharp
The key of G major looks like this:
G A B C D E F# (G)
Let that sink in for a little bit. Count up five notes from the current key and that tells you the next key in line (based on the number of sharps). More importantly, you have a better idea of what notes are included in the key.
We'll come back to this tomorrow. Have a great day!
Peace~
Dave | 
