A very good friend of mine was killed many years ago and then buried in his hometown. I want to see her grave now, but how can I find it?

The family moved, and the grave may have moved. If it is not moved away, the earth grave may not be obvious even if it has not been taken care of for many years. Stone graves and brick graves are ok. It would be nice if there were historic sites. Go there and ask where the mass graves or mass graves are. More likely to go to one grave after another. If there is no tombstone, there is really nothing to do. We'd better find a way to contact her family. You can know the whereabouts of her family indirectly from your other friends and ask the original villagers, but this is time-consuming.