Piano chords come in all flavors — major, minor, diminished, augmented, and many kinds of extended chords such as 6ths, 7ths, 9ths, 11ths, 13ths, etc. This 50-minute video will give you a good introduction to piano chords and prepare you for more in-depth study:

Chords of all kinds: Major, minor, diminished, augmented & extended chords from chordman on Vimeo.

Tags: 6th chords, 7th chords, augmented chords, diminished chords, extended chords, major chords, minor chords