Newton’s Law
of Gravitation is a fundamental law we study in early classes. This law gives
the gravitational force of attraction between two bodies located at some
separation. This law forms the basis of understanding gravitational field
theory. To cover the basics related to Newton’s Law of Gravitation, see the
video below:

There are
some limitations of Newton’s Law of Gravitation, the cases under which the law
is not applied. To understand these limitations, see the video below:

When on a
body, two or more gravitational forces act, then for analysing the equilibrium
of body in state of rest, or for analysing the motion of body if it is in
motion, we need the vector sum of all forces acting on the body, so first we
need to understand how to represent the gravitational force in vector form. See
the video below for this: