Screw modifier to individual vertices I am beginner to blender

I have only two vertices in 3d viewport of blender
I need to apply screw modifier to only one vertex without modifying the other

Please help me out in this regard

Thanks in advance
You need only one vertex for it. Select this vertex. In the Screw modifier tab make an empty your AxisOb, select an axis and set the remaining params as required. By the way, you can apply this modifier to any object, such as a  circle.