Question

i want to know how we know about the past when it even occured

Answer 1

we get to know from history
evidences = archaeological inscriptions,monuments,coins,etc

Answer 2

We come to know about our pasts with the help of archaeologists. These are the people who study our past, they do researches which are known as archaeological researches. They study each and every single corner of any historical place and make the conclusions. They show us the proofs of any history regarding any particular area through their researches, the proofs which they show also include manuscripts, inscriptions, archives, any trace of our past. Archaeologists divided our past into three periods 1. Ancient period 2. Medivial period 3. Modern period. We also know about our past by reading books, magazines published by archaeologists.