Learn to play Old Joe Clark on (banjo) ukulele. I show this at various levels from beginner with just two chords and simple strumming, to more advanced strumming and some chord melody style. You can play this on any ukulele - I use the banjo ukulele (banjolele) to demonstrate on but it's played the exact same way on a regular ukulele.
Be sure to meet up with all the Four String Strummers at our new Facebook Group!
https://www.facebook.com/groups/6666720290056917