It depends on what you’re looking for. If you want to buy a car and drive it a lot, then you want to inspect the car for mechanical issues and listen to the car’s engine for any noises that shouldn’t be there.  If you just want to buy a cheap car and sit in it and look at it, you’ll want to give the outside of the car a good inspection to make sure it doesn’t have a lot of dents or other cosmetic issues.  Are you interested in buying a specific car, or just picking up any car for sale?
assitant
What specific parts of the car are you concerned about, and how do you currently inspect them?
assistant
How should I inspect a used car before I buy it?
user