You can publish brilliant content and still rank nowhere if search engines cannot crawl, understand or trust your site. Technical SEO is the plumbing beneath everything else: invisible when it works, costly when it fails.
In 2026 the stakes are higher, because AI engines such as ChatGPT, Perplexity and Google’s AI Overviews also rely on clean, well-structured sites to find and quote answers. This is the checklist every business website should run, in the order I would work through it.
Table of Contents
1. Make sure search engines can crawl and index you
Start here, because nothing else matters if Google cannot see your pages. Open your robots.txt file and check it is not blocking important sections, then look for stray “noindex” tags left over from a staging site or a redesign.
Next, open the Pages report in Google Search Console. It shows which pages are indexed, which were excluded and why, from duplicates to redirects to pages Google crawled but chose not to index. Unindexed pages simply cannot rank.
Finally, keep an XML sitemap that lists only the pages you want found. It should hold live, canonical URLs, with no redirects, 404s or thin tag pages, and it should be submitted in Search Console.
2. Speed and Core Web Vitals
Fast loading is non-negotiable. Google’s Core Web Vitals measure loading (Largest Contentful Paint, under 2.5 seconds), responsiveness (Interaction to Next Paint, under 200 milliseconds) and visual stability (Cumulative Layout Shift, under 0.1).
Most sites still fall short. According to the HTTP Archive’s 2025 Web Almanac, only 48% of mobile websites had good Core Web Vitals in July 2025.
The usual fixes are unglamorous: compress and correctly size images, defer scripts you do not need on load, and reserve space for banners and embeds so the page does not jump. Faster pages rank better and, just as importantly, keep visitors from leaving before they read a word.
3. Mobile-first, by default
Google uses the mobile version of your site for indexing and ranking, so a poor mobile experience limits you everywhere. If content, links or structured data appear on desktop but are hidden on mobile, Google may never count them.
Test key pages on a real phone, not just a resized desktop browser. Check that buttons are easy to tap, text is readable without zooming, and pop-ups do not cover the content a visitor came for.
4. Site structure and internal links
A clear structure helps both visitors and crawlers. As a rule of thumb, every important page should be reachable within three clicks of the home page, and no page should be an orphan with no internal links pointing to it.
Use descriptive anchor text rather than “click here”, and add breadcrumbs on deeper pages. Where similar pages compete with each other, set a canonical tag so Google knows which version to rank.
5. Structured data and AI crawlability
Structured data (schema) tells search engines exactly what your content is: an organisation, a local business, an article, a service or a set of FAQs. It can earn richer search results, and it increasingly helps AI engines extract an answer and attribute it to the right source.
Start with Organization or LocalBusiness schema, then add Article, FAQ and Service markup where it genuinely fits the page. Validate everything with Google’s Rich Results Test before it goes live.
While you are in robots.txt, check you are not accidentally blocking the crawlers behind AI search, such as OAI-SearchBot for ChatGPT search and PerplexityBot. Blocking them can keep your pages out of the answers your buyers now read first.
Getting schema right for both search and AI is specialist work; a Singapore agency such as M’ai Digital implements structured data so a site is understood by Google and quotable by AI engines — the same foundation now serves both.
6. Security and site health
HTTPS is a baseline trust signal. Without it, browsers warn visitors away, and every page should load securely with no mixed-content warnings.
Broken links, redirect chains and duplicate pages build up quietly over time. Fix 404s that still receive links or traffic, point redirects straight to their final destination, and remove or consolidate near-identical pages.
7. Keep a simple maintenance rhythm
Technical SEO is not a one-off project. Check Search Console for new errors every week, review Core Web Vitals and broken links every month, and run a full technical crawl every quarter.
Before any redesign or platform migration, map every old URL to its new one. Most of the serious ranking drops I see trace back to a launch where nobody owned the redirects.
None of this is glamorous, but it protects every piece of content and every marketing dollar that sits on top of it. Work through the list once, fix what you find, and then keep the routine going.