Question

on what basis did estates were divided

Answer 1

the estates clergy and nobility and common who divided on the basis of the people and their status for example in the clergy all the people who belongs to the church and vices bear and the nobility including all the nights nobleman but in the common were included the poorest of poor like the professor ECE engineers doctors extra

Answer 2

they were divided by
first estate-clergy
second estate-nobility
third estate-common people ( they had rich and poor among themselves)