This document provides advanced strategies for link building for affiliate sites. It discusses how links are the most important ranking factor for search engines like Google. While on-site optimization can help rank for low competition keywords, links are what Google uses to differentiate between similar sites. The document recommends analyzing competitors' link profiles to identify the types of links that rank highly, such as branded and keyword anchor text links. It also provides tips for link building through content syndication, guest posts, link exchanges, and more to build brand authority over competitors before focusing on keyword anchor text links. Paying for links is risky unless a site already has strong brand authority.