What is Article schema?
Article schema is structured data that names a page's headline, author, images and dates. Learn the types, the useful properties and how to add it.
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What is breadcrumb structured data?
Breadcrumb structured data describes where a page sits in your site, from the home page down. See the BreadcrumbList format, an example and how to test it.
What is crawl budget?
Crawl budget is how many pages Googlebot will fetch from your site. Find out who needs to care, how to see your crawl activity and what wastes it.
What is DKIM?
Learn how DKIM signs outgoing email with a private key, how receivers check it against a DNS record, and how to confirm that your own signing works.
What is DMARC alignment (adkim and aspf)?
Understand DMARC alignment: how the SPF and DKIM domains must match your From domain, what relaxed and strict mean, and how adkim and aspf set it.
What is DMARC?
Learn what DMARC is, how it builds on SPF and DKIM to stop others spoofing your domain, and how to publish a first monitoring record safely.
What is duplicate content and does Google penalize it?
Learn what counts as duplicate content, why Google usually does not penalize it, and how to reduce duplicates with redirects, canonicals and unique text.
What is FAQ schema and does it still show in Google?
FAQ schema marks up questions and answers with FAQPage structured data. See what changed in Google Search, what it still does, and whether to keep it.
What is field data in Core Web Vitals (CrUX)?
Field data is performance measured on real visitors' devices and collected in the Chrome User Experience Report. See where to find it and its limits.
What is hreflang?
Hreflang tells Google which language or regional version of a page to show to which searchers. Learn the format, the rules and the common mistakes to avoid.
What is HSTS?
HSTS is a response header that tells browsers to use only HTTPS for your site. See an example, safe starting values and the preload risks to avoid.
What is INP in Core Web Vitals?
Interaction to Next Paint measures how quickly a page reacts to taps, clicks and key presses. Learn the 200 ms target and how to find slow interactions.
What is JSON-LD?
JSON-LD is the format Google recommends for structured data. See what it is, how a small block looks, where it goes on a page and how to test it.
What is lazy loading and when should I use it?
Lazy loading delays images and frames until they are close to view. See when it helps, when it hurts your main image and how to add it correctly.
What is LCP in Core Web Vitals?
Largest Contentful Paint times how long the main content takes to appear. See the 2.5 second target, what element counts and where to measure it.
What is mixed content and how do I fix it?
Mixed content happens when an HTTPS page loads images, scripts or styles over HTTP. See why browsers block it and how to find and fix every case.
What is MTA-STS?
Learn what MTA-STS is, how a DNS record and a policy file make other mail servers use encrypted TLS when sending to you, and how to roll it out safely.
What is Organization schema?
Organization schema tells search engines your business name, website, logo and official profiles. See the key properties, an example and where to put it.
What is reverse DNS (PTR) and why does email need it?
Learn what a reverse DNS PTR record is, why mail servers check it on the sending IP, and how to test and request one for your own mail server.
What is robots.txt?
robots.txt is a small text file that tells crawlers which parts of a site they may visit. See what goes in it, a working example and common pitfalls.
What is the best JSON-LD testing tool?
Compare Google's Rich Results Test with the Schema Markup Validator, see which to run first, and learn how to read errors and warnings in your JSON-LD.
What is the sitemap size limit?
A sitemap file may hold 50,000 URLs and 50 MB uncompressed. See how to count yours and what to do when a site grows past either limit.
What is the sp= tag in DMARC?
Learn how the DMARC sp= tag sets a separate policy for subdomains, when it is inherited from p=, and how to protect domains that never send mail.
What is the viewport meta tag?
The viewport meta tag tells phones how wide to make your page. See the standard tag, what each part means and why you should not block pinch zoom.