Question

Why planets revolve around in elliptical orbits they may have different paths to go around and why only in elliptical why not in circular path

Answer 1

It's not easy to arrange a perfectly circular orbit for an inverse-square law - just a small tweak (either in the initial conditions, or from interplanetary interactions or impacts) will change the path from a circular orbit to an elliptical one. But, if you look at an ellipse from the right angle, it will appear circular. So, consider it a matter of viewpoint!