you don't have to do as much as most people here suggest. but you certainly can.
i make sure the tires are pumped and oil the chain if it sounds noisy.
once you get used to riding your bike daily you'll notice if something is out of whack. then you go home and fix it.
i do replace chains rather frequently and am getting in the habit of repacking my hubs on a regular basis. you really just gotta keep an eye on your bike. it will tell you if stuff is wrong.