If I would like to know more about the different human culture around the world, which one should I study?

My understanding is: anthropology divides into physical anthopology and cultural anthropology. Physical anthropology is the study of artifacts and structures where people lived; cultural anthropology is the study of the way a tribe or group lived or lives today, to understand their customs, laws, and habits. Sociology is the study of behavior of groups, as compared to psychology, the study of the behavior of individuals.