The first law states that an object in motion stays in motion until acted upon by an outside force and an object at rest will stay at rest until acted upon by an outside force. For example, a ball will not move unless it is kicked.
The second law says that an objects acceleration depends on it's mass, and the amount of force applied to it. If you hit two balls with the same mass with the different amounts of force, the acceleration will be different. The second law is also where we get the equation F=MA
The third law is that every action has an equal and opposite reaction. A rockets engines push down, so the rocket goes up.