What are the three newton's law? Explain me plz.

Newton's first law of motion states, "A body will remain in rest or motion in a straight line until an external force is applied." this is also called the law of inertia.

Newton’s second law of motion: This law states that the acceleration of an object produced by a net force is directly proportional to the magnitude of the net force in the same direction of the net force and inversely proportional to the mass of the object.

The equation is,  $a=\frac{F_{net}}{m} $           

Where, $a$=acceleration, $F_{net}$=Net force, $m$=mass.

The equation can be rearranged as  $F=ma$

This law states that when two bodies interact, they apply forces to one another that are equal in magnitude and opposite in direction. This law is also known as the law of action and reaction. 

In other words, for every action, there is an equal and opposite reaction.

For example- If a bird exerts a force in a downward direction by pushing the air by its wings then the air pushes the bird in the upward direction with the same equal forces that were exerted by the bird in the downwards direction.