Final answer:
To add or delete points on a shape, you should use the Direct Selection tool. It allows you to manipulate anchor points on vector shapes, unlike brush and ink methods which are more about brushwork expressiveness.
Step-by-step explanation:
After creating a shape, you can use the Direct Selection tool to add or delete points on the shape. This tool is part of vector graphic software such as Adobe Illustrator and is used for manipulating anchor points of a vector shape. While the Pencil and Brush tools are indeed used for drawing and creating outlines, and the Pen tool is used for creating complex shapes with precision, the Direct Selection tool is the one specifically designed for editing already existing points and paths.
In contrast, when working with drawings made with brush and ink, artists rely on the dexterity of their hands to control the width of the line by using soft pointed brushes. This method, especially prevalent in Eastern traditions, is not about manipulating anchor points but about the fluidity and expressiveness of brush strokes on paper or other media.