My first Music Composition or Chord Leading Chart which is in Dmajor and its relative Minor Bminor. I really like the way this came out and will do most of the major keys here. Did the first in D because I really like the DADGAD tuning on acoustic guitar.
Know your scales, then you know your chords in each key; I ii iii IV V vi vii. Then write songs playing with the 7 chords in each key/scale. Add some dissonance to your chords, so not just Perhaps 1357 (Alicia Keys) or 12357 (Elton John).