What are some of the causes that lead to the transition from the Nomadic(someone who is always moving around) hunter and gatherer To that of a Sedentary villager (Someone who stays in one place)?

Trade and commerce, agriculture around them, and the need to survive is what causes a nomad to transition from one place to another. Although, when that nomad has found success in living and surviving they often stayed in one place, which is why they're known as sedentary villagers.