This document provides advice on different types of backlinks and backlinking strategies. It discusses four types of backlinks to avoid, including low-quality article directories, performing link exchanges at a large scale, thousands of automatically generated links from web 2.0 properties, and paid links that pass PageRank without a nofollow tag. It then outlines three circumstances to help determine appropriate backlinking opportunities based on website traffic levels and content quality. Finally, it provides email outreach templates for different backlinking techniques.