Music Theory

Not everything that's good has to be fun right? I am really interested and greatly intrigued by the depth of music theory. It seems like such a puzzling, yet useful skill. Hopefully it will sometime prove rewarding as a musician. So far I am just brushing up on music theory using some recommended websites from my friend and guitar teacher. It's definitely something I think will keep me busy for the rest of my life as long as I'm willing to learn.