@Wopu benefits to buying used is most issues are known manufacturing wise so look into specific years, parts availability, and general mileage/wear issues each specific vehicle has. Also carfax histories. Not ideal, but if you are looking at a dealership vehicle always get your own mechanic's opinion.
@FinalDresdonation @Wopu
Wopu, if you are going to get a used car go for a very common car, for example honda civic, you can find videos on YouTube on how to fix almost everything on a honda civic.