The document discusses different types of line used in drawing, including simple, contour, parallel, cross-hatching, stippling, scribble, and pattern lines. It provides examples of artists who employed various line techniques, such as Rembrandt's use of line quality to depict light, dark, and thickness. The document also outlines procedures for using line, such as starting with a light line and building up tones gradually to the darkest areas. Different pens, inks, and brushes are recommended for line drawing.