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Ratgeber zu Website-Gesundheit, SEO, Geschwindigkeit, SSL und E-Mail-Zustellbarkeit.
06.10.2026 · 8 Min. LesezeitAlternate Page With Proper Canonical Tag: What It Means
Search Console lists pages as Alternate page with proper canonical tag. Learn what the status means, when it is normal and when it reveals…
05.10.2026 · 8 Min. LesezeitCDN Cache Hit Ratio: Why Your CDN Is Not Making You Faster
A CDN only speeds up your site when it serves pages from cache. Learn what cache hit ratio means, how to check it and…
04.10.2026 · 8 Min. LesezeitDKIM Selectors Explained: How to Find Yours and Use Several
A DKIM selector tells receivers where to find your public key. Learn how to find the selector you use, run several senders and rotate…
03.10.2026 · 8 Min. LesezeitOpen Redirects: How Attackers Abuse Your Website’s Links
An open redirect lets attackers send visitors from your trusted domain to phishing pages. Learn how to find open redirects and fix them in…
02.10.2026 · 8 Min. LesezeitWhy Google Rewrites Your Title Tags and How to Prevent It
Google often shows a different title than the one you wrote. Learn why it rewrites title tags, how to spot rewritten titles and what…
02.10.2026 · 9 Min. LesezeitIs AMP Still Worth It? Accelerated Mobile Pages Today
AMP no longer earns a search badge or Top Stories access. Learn when keeping Accelerated Mobile Pages still makes sense and how to remove…
01.10.2026 · 7 Min. LesezeitPostmaster and Abuse Mailboxes: Why Every Domain Needs Them
Postmaster, abuse and other role addresses let mail servers and people report problems with your domain. Learn which ones you need and how to…
01.10.2026 · 8 Min. LesezeitSSL Private Keys: How to Store, Protect and Replace Them
Your SSL certificate is only as safe as its private key. Learn where keys should live, who may access them, and what to do…
01.10.2026 · 7 Min. LesezeitPDF Files and SEO: How Google Indexes and Ranks Your PDFs
Google indexes PDFs like web pages, but they convert poorly. Learn how to optimise PDFs, when to use HTML instead, and how to keep…
01.10.2026 · 8 Min. LesezeitImage CDNs Explained: Automatic Resizing and Modern Formats
An image CDN resizes, compresses and converts images on the fly for each device. Learn how it works, what it costs, and when it…
01.10.2026 · 7 Min. LesezeitDMARC Failure Reports (ruf): What They Show and Their Limits
DMARC failure reports send details of individual messages that fail checks. Learn what ruf and fo do, why few providers send them, and privacy…
01.10.2026 · 7 Min. LesezeitFile Permissions on a Web Server: Safe Settings Explained
Wrong file permissions let attackers change your site, while 777 hides deeper problems. Learn what 644, 755 and 600 mean and how to set…