Link Building: The Complete Guide to Earning Backlinks That Move Rankings

Link building is the work of earning links from relevant, reputable sites. This guide covers what makes a good backlink, the strategies that work, and what Google's spam policies rule out.

Anjan Luthra

Managing Partner · 9 min read

See the diagram

Published · Updated

Key Takeaways

  • Links from relevant industry sites placed within article body content carry more SEO weight than links buried in footers or sidebars on unrelated domains.
  • There's no fixed timeline for a backlink to affect rankings: a link can only count once Google has crawled the page it sits on.
  • Google's spam policies treat links bought for ranking purposes as link spam; paid or sponsored links need rel="sponsored" or rel="nofollow".

Link building is the process of getting other websites to link to yours. Each link acts as a vote of confidence: a signal to search engines that your content is worth referencing. Links from relevant, reputable sites help Google discover your pages and understand which ones are worth showing, which is why they still matter for rankings.

That's the simple version. The reality is more nuanced. Not all links are equal. A link from a major industry publication carries far more weight than a link from a random directory. And the way you earn links matters too: Google's spam policies are clear about what constitutes manipulative link building. The line between a smart strategy and a risky shortcut is thinner than most people think.

Every few years, someone declares that links are dead as a ranking factor. And every few years, the data proves otherwise. Ahrefs' research consistently shows a strong correlation between the number of referring domains pointing to a page and its organic search traffic. Google's own guide to its ranking systems lists link analysis systems, including PageRank, among the ways it works out what pages are about and which might be most helpful.

What has changed is how Google evaluates them. The algorithm is better at identifying paid links, link exchanges, and PBN (private blog network) schemes. It's also better at understanding context: a link from a relevant industry site in the body of an article is worth more than a link buried in a footer or sidebar on an unrelated domain.

AI search adds another dimension. For AI Overviews and AI Mode, Google says the same SEO best practices apply, so links that help a page rank in Search help there too. Other AI tools don't publish how they choose sources, but earning mentions on reputable sites puts your brand on the pages those tools are most likely to read.

A good backlink has three qualities: relevance, authority, and editorial placement. The linking site should be topically related to yours. It should be a reputable site in its own right. Third-party scores like Domain Rating or Domain Authority are a rough guide here, not something Google uses. And the link should appear naturally within the content, placed by the author because your page genuinely adds value to their article.

For a detailed breakdown of what separates a valuable link from a worthless one, see our guide on what makes a high-quality backlink. The short version: if you'd be embarrassed to show the link to a Google engineer, it's probably not worth pursuing.

Content-Led Link Building

The most sustainable way to earn links is to create content that other people want to reference. Original research, data studies, comprehensive guides, and unique frameworks all attract links naturally because they provide something that doesn't exist elsewhere. When a journalist needs a statistic or a blogger needs a source, they link to the page that has the answer.

This approach is slow but compounds. A well-researched data study can earn links for years after publication without any ongoing outreach.

Digital PR

Digital PR is the practice of getting your brand mentioned and linked in online publications: news sites, industry blogs, trade journals. It works by creating newsworthy angles: original data, expert commentary on trending topics, or contrarian takes that journalists want to quote.

The key difference between digital PR and traditional PR is the focus on the link. Every placement should include a backlink to a relevant page on your site. Our article on digital PR for link building covers the mechanics of how to pitch, what journalists actually respond to, and how to measure the SEO impact.

Guest Contributions

Writing for other publications in your industry is a straightforward way to earn editorial links. The approach works when you're contributing genuine expertise to a relevant audience, not when you're mass-producing generic articles for any site that will take them.

Target publications where your ideal customers read. Write something that demonstrates your thinking, not a thinly disguised sales pitch. The link in your author bio or within the article body is the SEO payoff, but the real value is positioning yourself as a credible voice in your space.

Broken Link Building and Resource Page Outreach

Broken link building involves finding pages that link to resources that no longer exist (404 errors) and suggesting your content as a replacement. Resource page outreach targets curated lists of links on a specific topic and pitches your page as a worthy addition.

Both tactics work because you're solving a problem for the site owner: they have a broken link or an incomplete resource page, and you're offering a fix. The success rate is modest, but the links you earn are typically high quality because they're editorially placed on relevant pages.

What to Avoid

Paid links are the most common shortcut, and the most dangerous. Google's spam policies treat buying or selling links for ranking purposes as link spam, whether you pay in money, goods, services or free products. Paying for a placement is fine for advertising or sponsorship, as long as the link is marked rel="sponsored" (or rel="nofollow") so it passes no ranking credit.

Unmarked paid links carry two kinds of risk. Google's systems can detect transactional patterns, such as sudden spikes in links from unrelated sites, links from link farms, and exact-match anchor text across dozens of domains, and simply ignore those links, so the money is wasted. Separately, a human reviewer can issue a manual action for unnatural links, which can affect specific pages or the whole site until you clean up the links and file a reconsideration request.

Link exchanges ("I'll link to you if you link to me") are named in Google's link spam policy when they are excessive, along with partner pages that exist only for cross-linking. A few natural reciprocal links between genuinely related sites are fine. Systematic exchanges are not. The same goes for PBNs, comment spam, and directory submissions to sites that exist solely for SEO purposes. For a fuller comparison, see our piece on paid vs editorial backlinks.

The obvious metric is the number of referring domains pointing to your site. But quantity alone is misleading. Track the quality of links earned (how relevant and reputable the linking sites are, with third-party scores as a rough guide), the pages they point to (are your priority pages getting links?), and the downstream impact on rankings and organic traffic.

Tools like Ahrefs' backlink checker and Moz's Link Explorer make it straightforward to monitor your backlink profile over time. Review it monthly. Look for patterns, which content types attract the most links? Which outreach approaches have the best conversion rate? Double down on what works.

If you want a team that builds links through editorial quality rather than shortcuts, explore Indexed's link building services.

FAQ

There's no universal number. It depends on the competitiveness of your target keyword, the authority of your domain, and the quality of links your competitors have. For low-competition keywords, a handful of quality links may be enough. For competitive terms, you may need dozens or hundreds of referring domains. Focus on earning the best links you can rather than hitting an arbitrary target.

Yes. Links are still part of how Google ranks pages, and Google says the same SEO best practices apply to its AI features. The investment is worth it when done correctly: earning editorial links from relevant, authoritative sites. It's not worth it when it means buying links from low-quality sources that put your site at risk.

There's no fixed timeline. A link can only count once Google has crawled the page it sits on, so links from frequently crawled sites tend to be picked up sooner, and links from smaller sites may take longer to be discovered. How much a link moves rankings also depends on your competitors and everything else about your page.

Link building is a long game. The links you earn today compound over months and years, strengthening every page on your site. At Indexed, we build link acquisition strategies grounded in editorial quality and genuine relevance. If you want to understand what a realistic link building plan looks like for your business, talk to a strategist: we'll walk through your current backlink profile and where the opportunities are.

Anjan Luthra

Written by

Anjan Luthra

Managing Partner, Indexed

Anjan Luthra is Managing Partner at Indexed. He has spent over a decade inside high-growth companies building organic search into their primary acquisition channel, and writes about SEO strategy, AI search, and revenue attribution.

Share

One email a week

How to turn search into revenue.

One idea a week from live client work: what we changed, what it was worth, and what you can take from it.

One email a week. Unsubscribe in one click.