The four most common types of piano chords are the major, minor, diminished and augmented.

The best way to form the major triad chords is stacking the major third and perfect fifth note on top of the root note.

The best way to form the minor triad chord is by stacking the minor third and perfect fifth on top of the root note.

The diminished chord can be formed by stacking two minor thirds on top of the root note.

The augmented triad chord can be formed by stacking two major thirds on top of the root note.

The below infographic shows you form the most common types of piano chords: