We say "wings" but birds have arms, which are structured the same way as human arms.
They have hands, and they still have the 3 fingers inherited from dinosaurs, although two of them are almost completely fused. Their thumb is still free, and is used to maneuver the "alula", a small "micro-wing" that they use for fine navigation.
Their legs are almost unchanged from the dinosaurs, except their fibula has shrunk, and partially fused to the fibula, and their metatarsals are - like their hands - fused together.