It was during the writing of this piece that I learned one of my first chord progressions, which I discovered on my own after fiddling around with my keyboard at home: the I-V-vi-IV chord progression. This chord progression is a staple of western music, and can be seen across many genres, although in my experience it's mostly pop and video game BGM.
https://en.wikipedia.org/wiki/I%E2%80%93V%E2%80%93vi%E2%80%93IV_progression features a convenient list of many examples.