I am just a beginner in Blender, When I am editing an object on the plane, the 3D Viewport is not showing the accurate direction and path, due to which I am unable to do editing easily on that object. I tried to focus the camera on the viewport, but it wasn't helpful.How should I correct the angle of the camera?
I'm not entirely sure what you mean, but you can always center your view to a specific object, face, vertex, ... by selecting it and pressing , on your NumPad.
The view now orbits around that point.
If you want to aim your active camera to the same view, press ctrl+alt+NumPad 0
To look around you, hit shift+f