This document discusses different types of links and strategies for building links to websites. It explains that nofollow links do not pass ranking value like dofollow links. It also discusses the importance of anchor text matching targeted keywords and getting links from high page rank and relevant sites. The document provides examples of different types of links and strategies for natural link building over time, including directories, guest blogging, social sharing and building internal link pyramids. It advises studying competitors' backlinks and using viral content but avoiding outdated strategies like link exchanges.