Fix dings and scratches before selling my car?

Not sure what the body looks like. Sometimes it can pay off to fix dents on a premium vehicle. You don’t mention if this is Hyundai or a high end car.

On selling the vehicle do the transaction at the bank of your buyer. That way you can verify funds, have a witness if they are willing to provide and do it in a safe manner. Make sure to sell it as-is. DO NOT ACCEPT A PERSONAL CHECK.