#1
hey i know power chords and barre chord but what are some good rock/heavy metal chords?
#2
It depends on what context you use certain chords whether or not they're 'good' for heavy metal. Through experience, I've found the most commonly used chords are E, G, A, C and D in Maj, Min, 7, m7 and 5th forms.

I don't know if that helps.
#3
Heavy Rock/Metal=Power Chords


Another thing I like to do is play major and minor third intervals with an open string pedal tone, like this:


G-----5-------4---
D-----7-------5---
A-0-0--0-0-0--0-