Owning a vehicle is a huge responsibility. You owe it to yourself, to the environment, and to other drivers to maintain your car's health, to be insured for potential accidents, damage, or injuries, and to purchase a quality vehicle for a reasonable price.
The advantage in buying a used car is a much cheaper price. You can buy a used car from a car dealership or a private party. Buying from a private party may be the cheapest option, but it comes with increased risk that you will end up with car with mechanical problems.