1. Explore the needs of your own use first, what kind of car you want. 2. Check the condition of the car at all points. Prevent being dyed to sell cats. 3. Ask about the accident history of that car, whether it has been through a flood or a major accident before. both the name of the car owner Car inspection history Transitioned through the owner, how many people, etc. 5. Buy with a person or place that is reliable.