Open shapes have gaps, closed shapes don't.
On a closed shape, you can start at one point, go around the shape, and get back to the starting point without lifting your finger.
A jump rope is an open shape.
A hula-hoop is a closed shape. You can spin it around your body.
A bracelet is a closed shape. You can wear it around your wrist. But when you unclasp it, it becomes an open shape!
Great job learning about open and closed shapes.
Now, ace the practice to make sure you got it.