I picked up a stone with words on it. What does this mean? If it's not good, just throw it away.

Tibetans. This is a bit like Nima Stone in Tibetan areas.

Nima stone is a small stone used by Tibetans to pray, but it is harmless.

Of course, it may also be a handicraft engraved with Tibetan.

Keep it if you like.

But I suggest you throw it away. After all, it is not good-looking, and it is much worse than Chinese culture.