What do people nowadays keep on their Camera Roll section of the iPhone?

The average/normal ppl, what do they keep? Is it just selfies, family/friends photos? Or also screenshots, memes, "adult" stuff, etc.

I would like to know so that I can clean up my storage with what normal ppl have, thanks.

You could put whatever you want there. I don't see why it has to be something specific to what "normal people" have.