We would have to travel places to find food. We would also have to hunt and gather food.
We discovered agriculture and we could stay in one place.
We had more food because we were able to grow our own crops.
We would not stave for food because we did not have to move around and find food by our selves.
We learned this was important because having a stable food supply is much easier than having to move from place to place to find enough food to survive.