Three technical types dominate the backlink taxonomy: dofollow links pass PageRank and directly influence rankings, nofollow links carry a rel="nofollow" attribute that tells search engines not to count them as votes (though Google still uses them for discovery and may assign some value), and UGC or sponsored tags signal user-generated content or paid placements respectively. Google introduced UGC and sponsored in 2019 to replace blanket nofollow usage, giving crawlers more context. Beyond HTML attributes, backlinks differ by editorial quality and context. Editorial links come from journalists or content creators who link because your content is genuinely useful—these are gold. Guest post links sit in contributed articles and range from legitimate thought leadership to thinly veiled link schemes, depending on disclosure and relevance. Directory and citation links from business listings like Google Business Profile or Yelp matter for local SEO but carry minimal weight for organic rankings. Forum and comment links are almost always nofollow and frequently spammy unless you're participating authentically in niche communities. Placement changes value dramatically. A contextual link inside the main article body on a relevant page outperforms a sidebar or footer link by 3–5x in our portfolio testing. Anchor text also segments links: exact-match anchors (your target keyword) are powerful but risky in bulk, branded anchors are safe, and naked URLs or generic phrases like "click here" pass authority but minimal topical relevance. At Ottawa SEO, we prioritize dofollow editorial links from Canadian industry publications, local news sites, and niche blogs with real traffic. We track not just link count but referring domain diversity, topical alignment, and whether the linking page itself ranks. A single contextual dofollow link from a DR 60+ site in your vertical beats 50 directory submissions. We also monitor for toxic links—scraper sites, PBNs, or irrelevant foreign domains—that trigger manual penalties. The type matters less than the ecosystem: one well-placed link in the right context delivers more than a dozen low-quality variants.