Final answer:
People learned to use river floods to their advantage by building dams and levees and practicing irrigation techniques. By building dams and levees and practicing irrigation techniques, people were able to use river floods for their benefit.
Step-by-step explanation:
The people learned to use river floods to their advantage in several ways. One way was by building dams and levees to control the flow of water and prevent flooding. Another way was by practicing irrigation techniques to divert water from the river to their farmlands. By doing so, they could irrigate their crops and ensure a steady water supply. By building dams and levees and practicing irrigation techniques, people were able to use river floods for their benefit.