Like any other animal or poultry, they need daily care of feeding, watering, cleaning up afterwards, watching out for weather, etc... Each type of quail can have different requirements for housing, breeding etc.. Some are easier than others.
We raise bobwhite quail. If it were up to me, we wouldn't. We do raise thousands of them, so that could be why I am not the biggest proponent of raising them.
I have 16 that are pets. Once they are adults, they are easy to keep.