About 2 million years ago nomads (hunters/gatherers) had to hunt and gather all the food they ate. Nomads also didn't have permanent shelters. They usually had to stay in caves, where cave painters usually leaved art. Since the nomads didn't have shelters they moved around very often.
The "Neolithic age" is when the nomads started to discover farming. Like raising animals and planting crop. Also learning to rely on animals for food. This is also when they started to domesticate other animals. Now after learning to farm they can stay in one permanent space. This took place in 8,000 B.C.E. until 3,000 B.C.E.
At this point in time (the paleolithic age) the people started to learn new things. They learned to establish communities. They've also learned to trade,make permanent shelters and create a stable food supply. One of the first things they did were build permanent homes. Some materials used were bricks and stones. Instead of having to hunt and gather things they can now harvest crops,domesticate animals and also trade things such as crops.