What is the first law?

The First Newton's law is the law of motion, also known as the law of inertia, states that an object will stay still or keep moving in a straight line at a constant speed unless a force acts on it. I am going to give a practical example:

Imagine you're playing with a soccer ball outside. If you kick the ball gently, it will slowly roll to a stop because of friction with the ground. If you don't kick it at all, it will just sit there, not moving. That's because the ball wants to keep doing what it's doing—either staying still or moving smoothly—unless something like your foot (a force) pushes it or stops it.