What did Shang people use to predict good or bad luck?

Burning tortoise shells predicts good or bad luck.

Shang, the ancestor of Shang Dynasty, is said to be a descendant of Gao Xin (Di Ku) from Shangqiu with a long history. During the Shun period, the Shang tribe made an outstanding military leader contract. Later, the Shang tribe called him "Xuan Wang" and made up a eulogy to praise him. "The bird was born in the sky and the merchant was born in the earth."

The social development of Shang tribes can be divided into three stages. The first stage is the Xia Dynasty's pre-Shang and pre-Gong era. The second stage is the early Shang Dynasty, represented by the Shang culture in Erligang, Zhengzhou. The third stage is the late Shang Dynasty, represented by the Yinxu culture in Anyang. At this time, the League of Nations developed to a very mature stage, and the Shang tribes lived in the big cities of China and became the real masters of the League of Nations.