Before the 1st agricultural revolution, there was no farming because people used hunting to gather food. This was difficult because there was no guarantee that they were going to find food if they did not see any animals.
During the 1st Agricultural revolution, hunter-gathering was being switched to farming. The fertile crescent is where the planned cultivation of seed crops began.
After the 1st agricultural revolution, seed selection made plants bigger. Wheat and barley were grown a lot.