Learn some simple basic jazz chords; Maj7, Maj9, 6, ,9, 13, min7, min9. Then learn some altered chords, min7b5, +7, 7b5, 7+9, 7b9. Learn a couple of simple standards using these chords. Like “Autumn Leaves”. This song is so great because it involves II-V-I in both major and minor. For instance...