Before agriculture was discovered the hunter went out to hunt. Hunter will go out and hunt for food. With being a nomad and moving a round you will not find food every day. Hunter often get injured or get killed
with agricultural revolution and domesticating they raised goats, cattle, sheep for there meat. cattle and goats for milk.
with permanent housing the can farm have a stable food source. they can plant seeds. And permanent shelter they use stones. tree branches, bricks to make permanent housing