Communities were very small during the Paleolithic times because people at that time were constantly on the move. They never really had time to develop the communities very well because they needed to go search for more food constantly. These people lived in groups with around 20-60 people.
Community living helped us become better organized because once we developed, we divided the work more efficiently.
One advantage that the we had was when we worked together we could defend ourselves over any threats more easily.
The establishment of communities was important because it made us develop better and gave us more time to invent things.
We also had more time to make our lives easier compared to how we used to live.