This document discusses off-page SEO and backlinks. It explains that backlinks are a signal to search engines that other sites endorse your content, and many backlinks from authoritative sites can help improve search visibility and rankings. It describes different types of links like internal, external, and backlinks. It provides characteristics of effective backlinks like relevance, authority, uniqueness. It discusses the E-A-T approach for backlinks to ensure they are from trustworthy sources. It lists factors of do-follow and no-follow links and common mistakes to avoid like low authority links, paid links, irrelevant niche sites, and building links too quickly.