Ya, but as everything is, you can make it as simple or as complicated as you want it. You can put a nice fancy W/D filter, a UV sterilizer, co2 injection, dose differnt nutrients for your plants, age your water in peat or something of the type to change it to exactly what the fish comes from in nature and have RO water, automatic water changer, feed your fish only live food that come form where they originate......or you could slap on a HOB or sponge filter, feed them flakes and pellets, do a waterchange every week and thats it.
Most of us fall somewhere inbetween there. I know i feed my fish special foods, change water once or twice a week, check temperature by way of stick on therometer every time i look at my tank.....but i don't do much else.