Distinguish push and pull factors, and classify migrations as internal or international and voluntary or forced.
Migration is the movement of people from one place to live in another, and geographers explain it through push and pull factors. Push factors drive people away from a place -- war, persecution, poverty, natural disaster, or a lack of opportunity. Pull factors draw people toward a new place -- jobs, safety, family already there, political freedom, or a better climate. Almost every migration decision involves both: something pushing from behind and something pulling from ahead.
Migration also sorts into two overlapping pairs of categories. Internal migration stays within one country's borders; international migration crosses a national border. Separately, voluntary migration is a choice, even a difficult one; forced migration is not truly a choice at all. A refugee is someone forced to flee across an international border due to war, violence, or persecution, and is legally distinct from an economic migrant who chooses to move for opportunity. Someone forced to flee their home but who remains within their own country's borders is called an internally displaced person (IDP).
Mastery looks like: They can identify push and pull factors in a migration scenario and correctly classify it as internal/international and voluntary/forced.
Common stumbles: Mixing up push factors with pull factors; assuming all migration across borders makes someone a refugee.