: Most states require an active auto insurance policy before you can title or register a new vehicle.
When you buy a car, the DMV paperwork required depends largely on whether you are buying from a private seller or a dealership. For a private sale, you are responsible for handling all documents, whereas dealerships typically manage the title and registration for you.
: A record of the transaction including the date, sale price, vehicle description (Year, Make, Model, VIN), and signatures from both parties.
In a private party transaction, you must ensure the seller completes their portion of the title correctly. Title Transfers and Changes - California DMV