1. Early humans lived nomadic lifestyles as hunter-gatherers but began settling in caves near water sources for shelter.
2. Around 10,000-5,000 BC, humans learned agriculture and began living in permanent settlements of huts and mud houses near their cultivated fields.
3. As populations grew and chiefdoms formed, social stratification emerged between rich elites living in fortified castles and poorer peasants and artisans living in surrounding areas, laying the foundations for early civilizations.