How to Play a I–IV–V Chord Progression on Your Ukulele
The good news for ukulele players is that the basis of almost all popular music is just three chords. If you can play the I, IV, and V chords of the basic chord families, you have a strong basis to help you tackle almost any song you come across, whether the genre is rock, pop, blues, country, jazz, or punk.
Using the C family as an example,
The I chord is C.
The IV chord is F.
The V chord is G7.