In most jobs, there is some sort of base level competency that is required to keep said job. A lot of requirements are universal: come to work on time, don’t steal money from your employer, don’t harass people.
There are, of course, some specific skills that specific jobs require specific prerequisites to even accomplish the job. You must be able to drive a vehicle in order to be an Uber driver. You must be able to maintain a high level of instrumental skill to be a professional symphony violinist. To work for a reputable journalistic outlet, you must actually create your content without plagiarizing others.