1. Lettering is the process of creating illustrations with letters, numbers, or characters. It is used for communication and adds beauty to drawings if done well. 2. There are four main types of lettering: mechanical, modern computer-aided, freehand, and single stroke commercial. Mechanical uses guides or templates while freehand is without tools. 3. The document discusses guidelines for printing different letter styles including proportions of lines, thickness of strokes, and appropriate uses of styles like Old Roman, Modern Roman, and Modified Roman. Tools for creating various lettering styles are also covered.