The early men need shelter, such as caves. But of course, there were more than one groups of nomads. They eventually battled and challenged each other for shelter.
Of course, everybody needs a home. But since this was early times, many people were nomads, people who travel very often for a new home. They traveled many times, and eventually settled into making their own village.
People eventually made villages. Villages convinced many people to come and many villages had big populations. Many people had food and shelter. They were all close by to communicate and visit each other.
Life as a hunter gatherer: Hunter gathered hunted animals and searched for plants for food. When hunter gathered couldn't find more food, they moved places to find more. They had tools to adapt to the new homes.
Villages convinced people to live in the villages. They were all close to each other to speak and communicate. But this could also be a bad thing, because if one person had a disease, it could spread.