How did the first money appear?

Initially and everywhere, all goods were exchanged, that is, there was a barter settlement system. But since each seller did not want to cheapen, but to give his goods with the best result for him, various disputes began to arise that could even develop into fights. Therefore, some measure was needed. To begin with, we tried to use grain and livestock, but realizing that nothing came of it, it was decided to use coins. The first metal coins appeared in China.