-----Edit-Points
Overview
Point editing is almost always used in conjunction with a primitive (eg:sphere-primitive, plane-primitive), an align-sweep object or an extrude smooth object.
The important tools are magnetism, selection and scaling. Unfortunately there is not time to go into detail on all of these here so they are consigned to 
Technique instuctions
Here are two graphic examples without much explanation. All I will say is that they use: Mode/Pick/Points, the rectangular and lasso selection tools and scaling.
1)Turning a tube into a leg

Pick some points, move and scale them. That's about all there is to do really.
2)Turning a Sphere into a head
a)Sphere.
b)Edited points.
c)Fracture and Smooth.
d)Added hideous texture map.

Templar ConstructionTechnique Reference
Main Pagesketch tutorial