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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 3 of 18.
- SEO12 min read
Canonicals across domains: syndication, mirrors and republishing
When one article lives on two domains, learn which case needs a cross-domain canonical, which needs noindex and which needs a redirect, with Google's current syndication advice and code.Updated 25 Sept 2026 - Speed12 min read
CDN basics: what a CDN fixes and what it does not
A CDN puts copies of your files near your visitors and takes TLS, HTTP/2 and compression off your server. What that changes, what it cannot, and how to set one up without caching the wrong pages.Updated 25 Sept 2026 - Security10 min read
Certificate chain errors: why it works in Chrome and fails elsewhere
A missing intermediate certificate hides in desktop browsers and breaks apps, curl, webhooks and crawlers. Read the chain, match the error to its cause and install the full chain on any server.Updated 25 Sept 2026 - Security13 min read
Certificate expiry: automate renewal, then monitor it
Public TLS certificates now last 200 days at most and 47 by 2029, so renewal has to be automatic. How each renewal stack works, the five ways it fails silently, and how to hear about it first.Updated 25 Sept 2026 - WordPress12 min read
Choosing a WordPress host by measured TTFB, not by reviews
How to compare hosts with numbers you measured yourself: cached and uncached TTFB from the same location, the field TTFB of real sites on that host, and a table template to fill in.Updated 25 Sept 2026 - Platforms13 min read
Cloudflare settings for speed and security, on the free plan
The Cloudflare free-plan settings that make a report go green, in order, with what each one changes, the traps (Flexible SSL, cache everything, Rocket Loader) and how to verify from outside.Updated 25 Sept 2026 - Accessibility12 min read
Colour contrast: fixing the most common accessibility finding
Low-contrast text is the finding almost every accessibility check reports. Learn the WCAG 2.2 ratios, the colours that fail most, and how to fix them once in your theme.Updated 25 Sept 2026 - Best practices11 min read
Console errors and deprecated APIs: what the report flags
What the console errors, deprecated APIs and document.write findings mean, where the errors usually come from, and how to reproduce and fix each one, with code for the common cases.Updated 25 Sept 2026 - Security10 min read
Content-Security-Policy: from report-only to enforced
Roll out a Content-Security-Policy without breaking checkout, analytics or embeds. Inventory sources, run report-only, read the reports, then enforce with nonces or hashes instead of unsafe-inline.Updated 25 Sept 2026 - Security10 min read
Cookie flags explained: Secure, HttpOnly and SameSite
What Secure, HttpOnly and SameSite do, which attack each one stops, which of your cookies need which flag, and how to set them in PHP, Express, nginx, Apache and WordPress.Updated 25 Sept 2026 - Best practices14 min read
Cookies before consent: does your banner actually block trackers?
See which cookies and trackers load before visitors answer your cookie banner, what EU rules require, and how to make Tag Manager, Consent Mode and your consent platform wait for the click.Updated 25 Sept 2026 - Speed13 min read
Core Web Vitals for e-commerce: product and category pages
Where shops fail LCP, CLS and INP on product pages, category grids and checkout, with the fix for each template, the WooCommerce and Shopify settings behind them, and how to measure per template.Updated 25 Sept 2026
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