I want to point out something that many beginners and even advanced players misunderstand about music theory.

There is no music theory that "doesn't work" or somehow "contradicts" some music you can play. The entire point behind music theory is to explain how to think about how the elements of music (notes, chords, rhythms) all relate to one another. It is a means of mentally identifying and organizing information about music. Whatever music you want to think about.

Theory is the conceptual side of music (thinking) and and practice is the physical application of music (playing).

You can completely ignore learning the theory side. That doesn't make it go away. It simply means you are unaware of how to think about what you are doing when you play any music you've memorized the physical motions it requires to play. It is still possible at any point to theoretically analyze any music that can be played.

I personally think a basic unstanding of theory is a great value. In depth, vast theory study is not necessarily for everyone. I always suggest to students to at least understand the basic ideas behind what they are able to play.

On GT start looking here:
http://www.guitartricks.com/category.php?input=theory

On the web, R. Shackleferd posted a number of good sites here:
http://www.guitartricks.com/forum/showpost.php?p=197307&postcount=1

If you wind up having specific quesitions about theory once you start studying, just ask! Hope this helps.