The pen tool lets you create straight lines and smooth flowing curves with greater precision than is possible with the freeform pen tool. For most users, the pen tool provides the best control and greatest accuracy for drwaing.
2.Add Anchor Point Tool
The add anchor point tools let you add points on a shape.
3.Delete Anchor Point Tool(P)
The Delete anchor point tools let you delete points on a shape.
4.Convert Point Tool
The convert point tool lets you convert a smooth curve to a sharp curve or to a straight segment.
5.Freeform Pen Tool
The freeform pen tool lets you draw as if you were drawing with a pencil on paper. Anchor points are added automatically as you draw. You do not determine where the points are positioned, but you can adjust them once the path is complete