Perfect fifths - otherwise known as power chords are pretty universal as far as music goes. Essentially, they look like this, if you can read tableture:
e-----
B-----
G---7
D---5
A-7--
E-5--
For a sloppy sorta thing anyway.
And then there's also the barre chord:
e-5
B-5
G-6
D-7
A-7
E-5
A Major essentially - a few changes in the fingering and you'll get a different type of chord. Moving the 6 on the G string down to a 5 will make the chord minor, moving the D to a 5 makes it a 7th chord...
I'd kinda recommend that you look around Youtube though, and I highly recommend checking out Lypurs' videos on Music Theory - they helped me a lot on my theory, not necessarily for guitar, but it generally boosts your knowledge of the workarounds of why some pieces of music sound like that - Lypurs' lessons start from absolute beginner, link to his channel here:
http://www.youtube.com/user/LypurThere are probably a lot of other sources that work for practical playing of the guitar on YouTube aswell, as well as textual sources. I also highly, -highly- recommend you take a peek at
www.circle-of-fifths.net, which is a fairly interactive website for learning a pretty important part of music theory.