Can someone pls explain to me the occupas problem? Im thinking of buying a property

So I was thinking of buying a bungalow or flat in Torreveja or somewhere other. Since we’re foregneris and would be there a few times a year, I would like to hire someone to take care of it, rent it out on airbnb etc.
Now, as far as I understood, the occupa problem is when you rent it out and someone does not want to leave. Is there any prevention for that or anything, should I not buy anything then?

Thank you in advance