This document provides an introduction and guide to search engine optimization (SEO). It is divided into three parts. Part 1 introduces key SEO concepts such as what SEO is, how search engines work, and the difference between white-hat and black-hat SEO techniques. Part 2 focuses on internal SEO factors including writing unique content, keyword research, on-page optimization of titles, meta descriptions and more. Part 3 will cover external SEO including links, authority, and link building strategies. The document provides information on SEO strategies and best practices to help websites improve their visibility and rankings in search engines.