Genuinely curious, are there a set of a disciplines a software QA engineers has to have? What tools do they use? (I only know they do software testing, but this

Genuinely curious, are there a set of a disciplines a software QA engineers has to have? What tools do they use? (I only know they do software testing, but this could mean a lot of different things) I understand what Devops (a similarly amorphous term) people do, but I've never had a clear picture of what the day-to-day life of a QA engineer would look like.