Power chords: A5 C5 D5 C5

A power chord is two or three notes: the root and the fifth above it. The shape stays the same; you move the whole hand along the neck.

Keep your fingers locked in the shape while you slide, and lift them just off the strings so the move doesn't squeak.

Palm muting means resting the side of your picking hand on the strings by the bridge. It gives the tight, chunky rock sound.