It used to be that used cars were purchased solely as acts of faith. Tires were kicked, leaks were hunted down, and the wad of receipts in the glove compartment might prove someone once cared about the machine. For a while.
In the 21st Century, virtually every used car is dragging a computerized trail of documentation. And that data has been commoditized in the form of informational websites like Carfax.com or Vincheck.me or whatever went live online in the last few moments. Some sites charge for the information. Some give it away. The relative worth of information you pay for versus that you get for free is something you can only discover with experience. Keep in mind, however, that spending a few bucks on researching a purchase that’s hundreds or thousands of times greater than that expense is likely worthwhile.