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In-depth guides
Longer walkthroughs for specific setups: real screenshots, code you can paste and the reason behind every step. The short fix page for each check lives under Learn.
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206 guides, page 7 of 18.
- SEO11 min read
hreflang in sitemaps vs in HTML: pick one and keep it consistent
hreflang can live in the page head, in an HTTP header or in the XML sitemap. This guide compares the three, shows a working sample of each, and explains how to pick one so the sets never disagree.Updated 25 Sept 2026 - SEO8 min read
Hreflang return links — why Google ignores your language tags
hreflang only works when every language version points back at every other one. Learn how return links fail, how to check all of them at once, and how to generate the tags so they never drift again.Updated 25 Sept 2026 - Security11 min read
HSTS: enabling it safely and joining the preload list
Turn on Strict-Transport-Security without locking anyone out, raise max-age in three stages, and decide whether the browser preload list is worth a commitment that is hard to undo.Updated 25 Sept 2026 - Best practices11 min read
HTML validation errors: which ones matter and which are noise
A validator can list 200 errors on a page that works. Learn the handful that change how browsers, screen readers and Google read the page, how to find them, and which ones you can safely ignore.Updated 25 Sept 2026 - Speed7 min read
HTTP/2 and HTTP/3 — what they change and how to turn them on
HTTP/1.1 loads six files at a time and queues the rest. HTTP/2 sends them all over one connection; HTTP/3 removes the slow handshake. This guide tests which one your site negotiates and shows the one-line change on each host, server and CDN.Updated 25 Sept 2026 - Accessibility12 min read
Image alt text: decorative, informative, functional
How to write alt text for decorative, informative and functional images, what to do with logos, product photos and charts, and how to find every image on a page that has none with the free checks.Updated 25 Sept 2026 - Speed14 min read
Image CDNs and on-the-fly resizing: URL parameter or build step?
An image CDN resizes and converts to WebP or AVIF from a URL parameter, so one master serves every screen. What the services cost, the URL patterns, the pitfalls, and when a build step is enough.Updated 25 Sept 2026 - WordPress14 min read
Image optimisation plugins compared honestly
ShortPixel, Imagify, EWWW, Smush, Optimole, TinyPNG and the core Modern Image Formats plugin, compared by what they actually do, what they cost and what none of them fixes. Pick one and measure the result.Updated 25 Sept 2026 - Speed8 min read
Image sizes that do not hurt — a practical guide
Images are most of the bytes on most pages. Find the 2 MB hero, the 1600-pixel thumbnail and the images with no width and height, then fix them with the right export size, format and attributes, on any CMS.Updated 25 Sept 2026 - SEO11 min read
Internal links that redirect: find them and fix them at the source
Internal links that answer with a 301 still work, but every click pays an extra round trip. Find them, fix menus, content and templates at the source, and keep the redirect for everyone else.Updated 25 Sept 2026 - SEO13 min read
Internal links: how many, where, and with what anchor text
Internal links are how Google finds your pages and how ranking signal moves between them. Realistic numbers per page, where links count most, anchor text that works, and a 15-minute audit.Updated 25 Sept 2026 - SEO13 min read
International sites: subfolder vs subdomain vs ccTLD, by the numbers
Choose between example.com/de/, de.example.com and example.de with a trade-off table, the signals Google really uses for country targeting, and the hreflang rules that hold on all three.Updated 25 Sept 2026
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