learn the hammer-ons and pull-off technique

Hammer-ons and pull-off are also called slurs.

Hammer-ons:
A hammer-on involves two different notes. Its done this way: A note is plucked and then a second note is sounded by slamming or hammering another finger on a higher note of the same string.

In internet tablature hammer-ons are represented by an "H'

placed between two notes. Another way that you may see a hammer-on represented in Internet tablature, is this symbol between 2 different notes ^.

                        or sometimes with an "H" on top

Pull-offs:

A pull-off is the opposite of a hammer-on. There are two notes involved. Before starting, you will need to have both left hand fingers that are involved already placed in their perspective frets. The first note is plucked, then a second note is sounded by pulling that finger off of the string with force. You are basically plucking the string with the left hand finger that you used for the 1st note first note. You will need to pull both towards the floor, and out away from the neck of the guitar.