SEO Basics guides.
Every seo basics guide we've published — 101 articles on the tactics, the tradeoffs, and what actually moves rankings.
What Is Grey Hat SEO? Link Tactics and Their Risk
What does grey hat SEO mean? See which link tactics sit in the grey zone (PBNs, paid links, swaps), what Google's spam policy says and how to judge the risk.
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How Does Google Evaluate Backlinks? Signals That Count
How does Google evaluate backlinks? See the signals that decide whether a link counts: relevance, source quality, placement, anchor text and spam checks.
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What Is Domain Rating (DR)? How Ahrefs Scores It
Domain Rating is an Ahrefs score from 0 to 100 for a site's backlink strength. See how DR is calculated, what counts as good, and what it can't tell you.
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What Is a Broken Link in SEO? Do They Hurt Rankings?
A broken link points to a page that no longer loads. Learn whether broken links hurt SEO, how Google treats 404s, and how to find and fix dead links on your site.
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Do Nofollow Links Help SEO? What They Still Do
Do nofollow links help SEO? Google says they are generally not followed, but they still bring traffic, discovery and a natural link profile. What to expect.
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How Is Domain Authority Calculated? (What Goes In)
How is domain authority calculated? Moz scores sites 1 to 100 with a neural network fed by linking domains, link strength and spam signals. Why it drops.
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Does Domain Authority Still Matter in 2026?
Domain Authority still matters as a benchmark, not a ranking factor. What Google has said about DA, what the score is good for, and what to track instead.
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What Is Negative SEO? (And How Much of It Actually Works)
Negative SEO is a deliberate attempt to hurt a rival's rankings, usually with spam links. What Google says it ignores, which attacks still work, and what to do.
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Is a Domain Authority of 20 Good? (What a Good DA Looks Like)
Is DA 20 good? For a site under a year old, yes; against national competitors, no. How to judge your Domain Authority against the sites you really compete with.
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Domain Authority vs Page Authority: What's the Difference?
DA scores a whole site and PA scores one URL; both come from Moz, not Google. What each number tells you, why they disagree, and which to check before a link.
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How Do I Insert Backlinks in a Website? (HTML and WordPress)
How to insert backlinks in a website: the HTML for a link, how to add one in WordPress and other builders, and why a backlink has to be placed by another site.
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What Was Google Penguin, and Is It Still Active?
Google Penguin explained: what the 2012 link-spam update targeted, how 2016 folded it into the core algorithm, and what replaced the Penguin penalty today.
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