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).
Beautiful painting by Zeng Hao! Green Tara - originally a Hindu goddess and later adopted by some forms of Buddhism. She is known as the mother of liberation, a protectress, an obstacle remover, and an earth mother.