How did the egyptians take advantage of the niles yearly spring flooding

They planted crops in the fertile river banks

Not only did they plant crops in the fertile river banks, but they built complex irrigation systems that carried the water from the river to crops farther away. Made use of the extra water. Furthermore, the Nile carried nutrients in soil & silt that were deposited during yearly floods and those nutrients fertilized the crops.

"teotihuacan was the cultural center of the zapotecs".

River valleys were good places for hunting and fishing.