This document provides an introduction to HTML and CSS for building websites. It begins with introductions and background on the instructor and Thinkful. It then discusses why students may be interested in learning web development. The document proceeds to cover basic HTML tags and elements to build a simple website, then introduces CSS to style the HTML. Key concepts of CSS like selectors, properties, and values are explained. Students are given challenges to practice these new skills. Finally, tips are provided for continuing to learn and information on Thinkful's programs is shared.