Need supplimentary materials for music theory

I'm a beginner guitarist. Currently I'm working with "A Modern Method for Guitar: 123 Complete" by William Leavitt. Looking for some good 101 textbooks for music theory.

After completing the first chapter of Leavitt's book, I have a feeling that I'm only learning to play the guitar. But I know very little about the theory behind the music.
For example, the very first thing I learnt is the C major scale. I can play the scale, but I don't know what scale signifies and how it's related to the C chord. Also there're variations of C chord [E G C E'] & [E G C F'], how do I know what to play with only the chord name is given?

Sorry if the above questions are difficult to understand as I'm not familiar with describing musical elements.

Thanks,
681726

EDIT: correct grammer

Hi mate!
Here are some links for you to learn everything in music theory and then practice yours skills on guitar.
http://www.musictheory.net/lessons
If you are an iphone ipad itouch user you can buy those guides to have them on the go!!

Quote:

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Originally Posted by Inthemusic

Hi mate!
Here are some links for you to learn everything in music theory and then practice yours skills on guitar.
http://www.musictheory.net/lessons
If you are an iphone ipad itouch user you can buy those guides to have them on the go!!

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Thanks for the great online resource.
I just skipped through the book that I'm using. It does have some information on chord structure spreading throughout the later chapters. My tutor told me that the best way for an instrumentalist to learn theory is from playing music that uses them.

No problem mate glad that i helped even a little . Keep it up with practice and you are going to be fine!!