How to scan bananas at self-checkout?

I'm curious, could you please elaborate on the process of scanning bananas at a self-checkout counter? Do I need to weigh them first? Should I scan the barcode if there's one on the banana's packaging? What if the bananas are loose and not in a package? Could you walk me through the steps from start to finish, so I can make sure I'm doing it correctly? I'd appreciate any insights or tips you may have on the subject.