The technical SEO checklist that still matters in 2026

Technical SEO has one job: make sure search engines can reach your pages, understand which ones count, and show them to people without a poor experience getting in the way. Google’s own documentation still centres on the same basics: crawling, indexing, page experience and structured data.

What has changed is the cost of getting it wrong. AI Overviews and AI Mode draw on pages that are already indexed and eligible to show a snippet, so a page Google cannot index is invisible in AI answers as well as in the blue links.

On audits, this is what we check first, because a fault in any of these five quietly caps everything else the site does.

Start with robots.txt. It should block things like admin areas, cart pages and internal search results, and nothing else. A single misplaced Disallow line left over from a staging site can block an entire section; we still find this after redesigns more often than you would expect.

Next, check that important content is in the HTML Google renders. Prices, product details or reviews loaded only after a user clicks, or hidden behind a script that fails, may not be seen. URL Inspection shows the rendered HTML, so compare it with what you see in the browser.

Finally, look for server errors and redirect chains. A run of 5xx errors tells Google to slow its crawling, and a chain of three or four redirects wastes crawl effort and dilutes signals. Point every old URL straight at its final destination.

• robots.txt blocks only low-value areas
• No important content that needs a click or login to appear
• Server errors near zero in Crawl stats
• Every redirect goes to its final URL in one hop

An online store with 400 products can easily produce tens of thousands of URLs once colour, size, sort order and tracking parameters are combined. If those URLs are crawlable and indexable, Google spends its time on them and may treat your real category pages as one of many near-identical options.

The tools are simple. A noindex tag keeps a page out of the index. A canonical tag tells Google which version of a duplicate you prefer, though Google treats it as a strong hint rather than a rule. robots.txt stops crawling but does not stop indexing; a blocked URL can still appear if other pages link to it, and Google cannot see a noindex tag on a page it is not allowed to crawl.

The Pages report in Search Console is where this shows up. Read the reasons under “Not indexed” and “Indexed” together. A large “Crawled – currently not indexed” count usually means Google is finding pages it does not think are worth keeping, which is a quality or duplication signal, not a technical glitch.

Core Web Vitals measure loading (Largest Contentful Paint), responsiveness (Interaction to Next Paint, which replaced First Input Delay in March 2024) and visual stability (Cumulative Layout Shift). Google’s published “good” thresholds are LCP within 2.5 seconds, INP within 200 milliseconds and CLS below 0.1, measured at the 75th percentile of real visits.

Use the Core Web Vitals report in Search Console, which groups URLs by template, rather than testing pages one by one. If every product page fails INP, the cause is almost always a shared script, and one fix lifts the whole group.

Structured data helps search engines understand what a page is about and which facts belong to which entity. Product markup can earn price and availability details in results; Organization and LocalBusiness markup help tie your name, logo, address and profiles together.

Two changes from recent years catch people out. Since 2023 Google shows FAQ rich results mainly for well-known government and health sites, and it has stopped showing HowTo rich results. The markup is not harmful and other systems may still read it, but do not expect it to change how your listing looks.

The rule that matters most is consistency. Marking up reviews, prices or answers that are not visible on the page breaks Google’s guidelines and can lead to a manual action.

Every site has a handful of pages that make money: core service pages, top categories, best-selling products. Count how many internal links point at each. On audits these pages often have fewer links than the blog archive or the privacy policy.

Fix it with descriptive anchor text (“GST billing software for retailers”, not “click here”), links from related articles to the relevant service page, and breadcrumbs that reflect a sensible hierarchy. Orphan pages with no internal links at all should either be linked or removed.

• List your ten most valuable pages
• Count internal links to each from a crawl
• Add contextual links from related content
• Keep key pages within three clicks of the homepage