This document provides an overview of different types of sketches used in the design process and basic sketching techniques. It discusses ideation sketches, exploratory sketches, explanatory sketches, and persuasive sketches. It emphasizes that sketching is an important skill for designers to communicate ideas, and that practice is required to develop this skill. The document then covers basic skills like drawing straight lines and parallel lines as warm-up exercises. It introduces two-point perspective and provides a step-by-step example of how to apply it when sketching a basic house. The goal is to help students improve their sketching and visualization abilities.