Hello!
Skeleton systems can be divided into the two main categories of axial and appendicular.
The axial skeleton consists of the bones on the axis of your body, or central core of your body. For example, your spine, ribs, sacrum, etc.
The appendicular skeleton consists of the extremities of the arms and legs, or basically every other bone. For example, your clavicle, scapula, pelvis, femur, phalanges, humerus, tarsals, etc.