If you're pretty new to the guitar, and want to learn a quick way to play with other guitarists, take a look at this
blues shuffle guitar lesson, which will show you how to play a basic blues rhythm pattern on guitar, including an intro and outro.
For those of you absolutely new to the instrument, here is some basic info... what a fret is, what a fret is made of, how many frets are on most guitars...
What is a fret on the guitar?

Most metal music features blisteringly fast guitar parts with high-flying pyrotechnics, which can be frustrating for the beginner guitarist. Not all metal songs are so unapproachable - here are 13 song tabs suitable for novice guitarists who want to improve their skills by learning to play metal music.
Easy Heavy Metal Guitar Tabs.
Looking for an interesting new scale to learn? The phrygian dominant scale is an exotic, unusual sounding scale that advanced guitarists can get a lot of use out of. Learn to play the phrygian dominant scale here.
The Phrygian Dominant Scale