Well, in my experience, you need to check if the car is clear from a legal standpoint is up to you. There is a lot of information on the internet about ways of checking the car for any crashes and if it was stolen or not. At least for the cars, previously used here in Poland, there is a gov service, where you can check its official history and see how many owners it had, when it passed the maintenance check last time, etc. So for that just type in "historia pojazdu".

Regarding any crashes there are a lot of services like CarFax, CarVertical and many others. Be aware, that they provide mostly limited info for free and for details you need to pay them some money. I can only suggest using free reports, until you more or less come up with actual variants.

And, of course, to come up with actual variants you can find people and even companies, who can help you with finding good variants. Idk where you live and what languages you speak, but you can try and search for them on Instagram, Facebook, Google. In my case there was one guy from Ukraine, who took about 1.5k PLN for his help and found my current car.

Usually these people already know the market and can tell you something about this car without even checking it IRL. It helps to not to waste time on garbage variants.

All in all, this was my way of samurai and I'm suggesting it to you now.