Beyond basic open position chords, basic movable form chords, and a core set of 4-part chords. There are just too many chords shapes too memorize. Learning the principles of how chords are constructed and the ukulele fingerboard are the way to go. You can then create more advanced chords like 9#11, 7#5-9, 13b5, 7+9 on the fly as needed from your core set of chords.