Duplicate Content and SEO: What Google Does and How to Fix It
How Google handles duplicate pages, why ordinary duplication isn't a penalty, where duplicates come from, and how to choose and signal the canonical you want.
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Articles
XML Sitemap Best Practices: Format, Limits, lastmod and Audits
The rules that make an XML sitemap useful: format and limits, sitemap index files, which URLs to list, accurate lastmod, submission, extensions and auditing.
301 vs 302 Redirects: Which to Use and How Google Treats Them
What 301, 302, 303, 307 and 308 redirects mean, how Google treats each one, why permanent redirects get cached, and how to pick the right code every time.
Page Not Indexed? How to Find the Exact Cause, Step by Step
A step-by-step way to find why Google hasn't indexed a page: read the Search Console status, check the signals in the right order, fix the cause and confirm it.