what exactly do Monks do?
and what do they eat?
they live a very, very, very difficult life, at least outside of the US. they work a lot, often teaching, building something, farming/gardening, or they're begging.
they're fed communally (some monks cook) or they beg for food, but they do it in places that expect this, and they're taken care of, not like homeless people here. although they aren't looking for good meals, most don't eat meat unless that's all they're offered (people don't offer meat).
the monks in my neighborhood play basketball and are driving school teachers
but it's still a difficult life. you have almost no personal liberty unless you're the abbot/banthi/whatever the local word is.
in some places it's like college (quite literally, because it's the best place to study). take tibet - a lot of dudes, like 60% or something, are monks at some point. it's not seen as taboo to leave the monastery, although many stay as well.