How much work or effort do you wish to put forth? Many who do not drive their car in lousy weather, or have it parked undercover can get away with some easy spray on or liquid wax to keep the shine. If your car sits outside during the day or night, gets driven in rain/snow and other lousy weather, then a good cleaner, followed by a sealer, followed by some good paste wax is going to be needed a few times a year.
Products I like are Mothers carnuba paste wax, as it provides a higher content of carnuba, which best protects your cars finish against dirt, abrasives, and other junk in the air that can settle onto your finish and dull it. Some paste waxes heat up in the sun during the day; dirt and other paticles settle onto your cars surface. When the temps cool at night, the wax cools as well, trapping this dirt into the wax. Carnuba has a high resistance to melting, somewhere into the 400 degree mark. There are synthetic waxes now that do the same as carnuba, but I've stuck with the Mothers paste carnuba, as it gives a great shine, and good protection.
Starting with a clean, smooth surface is key though. Some folks require a clay bar once a year to obtain a good clean and clear finish.
It is better to keep your mouth closed and let people think you are a fool than to open it and remove all doubt.