What is the main content of Oracle Bone Inscriptions's discovery (2~3 lines)

Mainly in the middle and late Shang dynasty, the Shang king asked for divination when he was in trouble. Wang carved some national or royal events on tortoise shells or animal bones, and then invited "Zhen people" to carry out divination activities. In fact, after some procedures, the Zhen people burned the carved Oracle Bone Inscriptions, and then predicted the good or bad luck according to the situation of burning cracks.