How much research or background checking do you do for a new occasional babysitter? (Like, for a date night, not for full time care). Does it matter if they were a friend’s recommendation vs a listing somewhere like vs someone you met at a childcare facility?

In my specific case, I just asked one of the gym childcare workers who seems to like my kids for her number for babysitting. I think the gym does some kind of background check but I don’t even know how old she is (I’m guessing late high school since the college kids went back to school a few weeks ago). Her Facebook profile has appropriate privacy settings which is good. My kid likes her.