Technical SEO Checklist: What to Audit and Why

What Technical SEO Covers

Technical SEO is the set of site infrastructure practices that ensure search engines can crawl, render, and index your content correctly, and that pages load quickly and work well on any device. It doesn't directly make content 'better' — it makes sure the content that exists actually gets a fair evaluation.

Crawlability

• Confirm robots.txt isn't accidentally blocking important sections, CSS, or JavaScript.
• Check that internal links use crawlable HTML anchors rather than JavaScript-only navigation with no fallback.
• Review crawl stats in Search Console for sudden drops that suggest a blocking issue.

Indexation

• Audit for accidental `noindex` tags on important pages.
• Check canonical tags point to the correct preferred version of each page, especially with parameters or trailing slashes.
• Submit an accurate, canonical-only XML sitemap and monitor the Coverage report for errors.

Site Architecture

• Keep important pages reachable within a few clicks from the homepage.
• Use clean, descriptive URLs instead of parameter strings.
• Maintain a logical breadcrumb structure that mirrors the site's information hierarchy.

Core Web Vitals and Page Speed

Largest Contentful Paint (LCP), Interaction to Next Paint (INP), and Cumulative Layout Shift (CLS) measure loading speed, interactivity, and visual stability respectively. These are measured from real user data (not just lab tests) and are one of the more direct ways user experience feeds into ranking systems.

Mobile Usability

Google indexes and ranks primarily using the mobile version of a page (mobile-first indexing). A page that renders poorly, hides content, or has tap targets too small on mobile is evaluated on that broken experience, even if the desktop version is flawless.

Structured Data

Schema.org markup (implemented as JSON-LD) doesn't directly boost rankings, but it removes ambiguity about what a page represents — an article, a product, an FAQ, a local business — which can make a page eligible for enhanced search result features.

Common Mistakes

• Auditing content before confirming the page is even indexed.
• Adding structured data that doesn't accurately describe the page's real content (this can trigger manual actions).
• Treating a single PageSpeed score as the whole picture instead of checking field data across real visits.

How to Measure Technical Health

Search Console's Core Web Vitals, Coverage, and Mobile Usability reports are the primary free monitoring tools. Re-run a full technical audit quarterly, or immediately after a site migration, redesign, or CMS change.