take a note, lets say C, that is the starting note. its also the name of the chord. move up by 2 white keys on the piano, in this case that will be E. move up by another 2 for your final note, in this case it will be G. play all three notes and its a chord. to make a minor chord, move the top note down by a half step. to make a major chord, move the top note up by a half step.