Riffs Tab Lessons

I would love to be able to master the guitar (i own an acoustic) i take online lessons, but i need more :]?

As i said i own an acoustic and would love to master this instrument. I so take online lessons, and they are great :]] i am a beginner, but do know how to play a small riff, a few chords and scales and am able to read TAB, any beginning pieces i could learn?

http://www.justinguitar.com/

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