chord that are so powerful, that they call it power chords. Ok also known as the 5th chords (?)
FInger a note on either the 1st(e) or 2nd string(a), then on the adjacent string, finger the note 2 frets away , then on the next adjacent string finger the note on the same fret as the previous
for instance, a G goes like this
E 3
A 5
D 5
G
B
E