It will affect everything about it if you don't have water it will be hard to grow, it decides what goods you will sell, how easy it is to get food, and if you are a hunter or farmer.
Geography decides the food ing habits , the clothing habits of people . On top of everything it decides the environment of that place
Geography determines the livelyhood of a society:their economic activities, mode of dressing and their technology.It affects their culture in general.
Geography can affect people because it is all around us, it is all of our climate, Hydrosphere, Biosphere, and our atmosphere, it is also our structure. All of those thing's are what affects us by geography. It's is amazing but it is what makes us human.