[Vexx]

"Common sense" equals "you agree with me" in most applications. It is often used by people who actually have very poor decision-making abilities or just go along with whatever "truths" they've been indoctrinated with.

Using F4 instead of F8 on a keyboard is not "common sense". Most POS sales systems really are Pieces Of Shit. They are NOT intuitive. You're going to simply have to treat the thing as an arcane set of magic spells and memorize the incantations exactly. My wife uses a multi-million dollar system at a multi-billion dollar pharmaceutical and it is a ROYAL piece of arcane shit. It takes six months to be marginally useful on it and that's only because you sit with a lot of other people also banging away at it.

Frankly, if this job pays your bills I'd stick with it. A happy job is much more important than a best-paying job. If you network well, it could also grow into a FT or possibly other work to supplement.