I just thought I'd throw this out there for anybody looking to learn theory.

 

http://www.ultimate-guitar.com/lessons/for_beginners/learning_music_theory_the_beginning.html

 

This article has been absolutely superb for me but it may be missed by many, with it being posted quite a while ago. Hope it helps :)

I thank you for that.  It looks interesting. 

No worries bud. 

 

I'm not sure what more experienced guitarists would make of it, but for me it's been fantastic 

This is an excellent guide! Thank you @dalenichol for the link!

Thanks mate! Been ages since i wanted to learn music theory.

that's a great link.. i remember having found it a couple years ago, when i started guitar, however completely forgot about it again.. thanks!

 

another link that i can recommend is (for some people obviously) http://www.musictheory.net/

it's not guitar-specific though..

Something else you may want to look into, is taking an online course from a university.  I am taking "Fundamentals of Music Theory" from the University of Edinburgh.  Its not guitar centric (as a proper theory class should be). and its free.

 

Quoting from the website: 

This course, from the University of Edinburgh's Reid School of Music (recently ranked first in the UK), is suitable for those who have never studied music academically. It will introduce you to the theory of Western music, providing you with the skills needed to read and write Western music notation, as well as to understand, analyse, and listen informedly.  

 

the link to the course is at https://www.coursera.org/course/musictheory

Hmmm, even though I took music theory 27 years ago, it was a high school elective course, I'm sure a refresher would be right on target.

Again it's like soccer, the longer you practiced it, the more you understand the theoretical strategies, and the less you will forget them..