Resolution is the headline spec, but it is not the whole story. 1080p can be fine if the sensor is good and the lens is sharp; 1440p or 4K helps with reading plates at speed, especially if you drive highways. Look for a wide dynamic range or HDR for day-to-night transitions and glare, and favor a lens with a bright aperture (for example f/1.8) plus a sensible field of view around 130 to 160 degrees to avoid extreme distortion.
A quick setup uses the 12V socket or a powered USB port. It is fast and reversible, but you will have a visible wire and the camera will shut off with the ignition. If you want true parking mode, consider a hardwire kit that taps the fuse box with an add-a-fuse harness and includes a low-voltage cutoff, so you do not drain the battery. Take your time routing the cable: tuck it under the headliner, down the A-pillar away from the airbag path, then under the weather stripping to the fuse panel. For a rear camera, follow the headliner to the back, and if you have a hatch, allow slack for the hinge movement.
A pro-level clean is less about shine and more about process. Work top to bottom. Start with a pre-rinse to knock off grit, use the two-bucket method with a pH-neutral soap, and swap mitts when they load up. Dry with clean microfiber and compressed air for crevices. Twice a year, decontaminate with a clay bar, then do a light polish if needed to level haze. Seal with a wax or sealant you are comfortable maintaining; the best product is the one you will actually reapply.
It is easy to get dazzled by shiny hardware, but the best tools are the ones you reach for often. A good torque wrench eliminates the "I think that is tight enough" guessing game. A simple infrared thermometer tells you what components are actually hot. A vacuum gauge, compression tester, and leak down tester can reveal engine health faster than any hunch. And yes, a multimeter is nonnegotiable. Electricity is the lifeblood of modern vehicles; you need to measure it, not vibe with it.
Another way to sidestep a full teen policy is to skip owning a car altogether. Car-sharing memberships, short-term rentals, and car subscriptions bundle access, maintenance, and often insurance under one monthly or hourly price. For teens who only need a car for specific events, seasonal jobs, or weekly errands, paying for access can beat paying to insure an idle vehicle. Many providers include liability coverage and collision protection with a deductible, so you are not shopping for standalone insurance at all.