to create chords we need to first find the scale of the root note.
for exampe if we want to work out a c major chord then we need the c major scale
to then work out the chord we need to have a formuler
for a major chord we take the first the thrid and the fith. the chord would be C E G. to create a minnor we need to take the third not and phlaten it this would then be C Eb G.
this imege below shows all of the chord formulers