They learnt in the home, on the farm, or trade.
The Indo Iranians were settled in Iranian plateau and north of Hindu Kush Mountains since 2800 BC. They start the culture of horse and chariots. The indo Iranians were the successors of the Proto Indo European people they played an READ MORE
The ‘ upper-town area’ of the cities of indus valley called ‘CITADEL AREA’.
As somebody else has answered it, it has been estimated from 3300 BC to 1300 BC. The peak period is said to be from 2500 BC to 2000 BC.