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Ratgeber zu Website-Gesundheit, SEO, Geschwindigkeit, SSL und E-Mail-Zustellbarkeit.
14.08.2026 · 8 Min. LesezeitIncomplete SSL Certificate Chain: How to Find and Fix It
A missing intermediate certificate makes some browsers, phones and apps reject your site while others work. Learn how chains work and how to fix…
13.08.2026 · 8 Min. LesezeitWhy Is My Page Not on Google? A Step-by-Step Checklist
A practical checklist to find out why a page is missing from Google: indexing checks, noindex and robots.txt, canonicals, quality issues and how to…
13.08.2026 · 8 Min. LesezeitGzip vs Brotli: How to Enable Text Compression on Your Server
Text compression shrinks HTML, CSS and JavaScript before they reach visitors. Compare Gzip and Brotli, learn how to enable them and check that they…
13.08.2026 · 8 Min. LesezeitEmail Blocklists: How to Check Your Domain and Get Delisted
Is your mail server or domain on a spam blocklist? Learn how DNS blocklists work, which ones matter, how to check them and how…
12.08.2026 · 7 Min. LesezeitSSL Certificate Name Mismatch: Causes and How to Fix It
A name mismatch error means the certificate does not cover the address the visitor used. Learn the common causes – www, subdomains, CDNs –…
12.08.2026 · 8 Min. LesezeitCanonical Tags Explained: How to Handle Duplicate URLs
What a canonical tag is, when to use one, how it differs from redirects and noindex, and how to fix the canonical mistakes that…
12.08.2026 · 7 Min. LesezeitLazy Loading Images: When It Helps and When It Hurts
Lazy loading can cut page weight or quietly slow your main content. Learn how native lazy loading works, which images to exclude and how…
11.08.2026 · 8 Min. LesezeitMX Records Explained: How Email Finds Your Mail Server
MX records tell the internet where to deliver mail for your domain. Learn how priorities work, how to check and change them, and the…
11.08.2026 · 8 Min. LesezeitFree vs Paid SSL Certificates: Which Does Your Site Need?
Free SSL certificates encrypt just as well as paid ones. Learn where they differ – validation, warranty, lifetime, support – and when paying makes…
11.08.2026 · 8 Min. LesezeitThe Noindex Tag: When to Use It and How to Check It
How the noindex tag keeps pages out of search results, which pages should use it, how to add it safely and spot an accidental…
10.08.2026 · 8 Min. LesezeitWebP vs AVIF vs JPEG: Which Image Format Should You Use?
WebP, AVIF and JPEG compared for real websites: file size, quality, browser support, encoding speed and tools, with a simple rule for choosing the…
10.08.2026 · 8 Min. LesezeitHow to Read DMARC Aggregate Reports Without Getting Lost
DMARC aggregate reports show every server sending mail with your domain. Learn how to read the XML, sort sources into groups and decide what…