To add to this. Get the Vin number and many free sites to run it. Look for recalls and have them fixed if needed.
Also agree about carfax and the like. It’s a nice tool but many things don’t get reported. It’s great having a clean one. That’s a great start at least but yes. Either have your mechanic or any mechanic look at the car. Many dealers won’t let you drive more then 5 miles radius due to their insurance on the car… Or at least they will tell you that. Totally worth paying $100 to not buy a dud car. If it really needs some fixing and you want the car it can become a negotiation point of reference.