Do Broken Links Affect SEO? What Actually Matters
Broken links are not an automatic ranking penalty. They waste crawl, hide dead-end equity, and become a quality issue when they are the site.
SEO fundamentals
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What Are Broken Links and Why They Hurt Your Website
A broken link is a URL that no longer leads where the author meant. Here is what 404, 410, and dead images actually do to users and SEO.