Type your best keyword into Google and the sites outranking you are not always better businesses. Often they simply run on better plumbing. Technical SEO is that plumbing: the work of making your website easy for search engines to crawl, understand and load quickly, so the content you publish gets the rankings it deserves. If you have ever asked what is technical SEO and been handed a wall of jargon in reply, this guide is for you. Here is what it covers, why it matters, and the technical SEO basics worth checking on any website, in plain English.
What is technical SEO, exactly?
Technical SEO is everything you do to help search engines access, crawl, interpret and index your website. It is one of the three pillars of search optimisation, alongside content, the words on your pages, and authority, the links and mentions that vouch for you. Content persuades people. Technical work persuades machines that your site is worth showing to people in the first place.
The clearest way to think about it: before your page can appear in a result, Google has to complete three steps. It has to find the page, read it, and store it in its index. Technical SEO removes the friction from each of those steps. It rarely wins rankings on its own, but nothing else can win them while it is broken, which is why our technical SEO service is the first thing we run on every new campaign.
Crawlability: can search engines reach your pages?
Crawlability is the first checkpoint. Googlebot discovers pages by following links and reading your XML sitemap, and it obeys the rules in your robots.txt file. If a page is not linked from anywhere, buried ten clicks deep, or blocked by a stray disallow rule, it may never be fetched at all. The usual crawlability killers are broken internal links, long redirect chains, orphaned pages, and the infinite URL variations that filters and on-site search can generate.
The fix is structural: a logical site architecture where every important page sits within a few clicks of the homepage, a clean sitemap that lists only the URLs you actually want indexed, and internal links that point crawlers at the pages that earn you money. None of it is glamorous. All of it decides whether the rest of your SEO can work.
Site speed and Core Web Vitals
Site speed is the part of technical SEO your visitors can feel. Google measures it through Core Web Vitals: how quickly the main content loads (LCP, ideally within 2.5 seconds), how fast the page responds to taps and clicks (INP, within 200 milliseconds), and how much the layout shifts around while loading (CLS, below 0.1). Slow, unstable pages lose visitors before they have read a word, and Google uses these measurements as part of how it ranks pages.
Most site speed problems trace back to a short list of causes: oversized images, bloated themes, plugin pile-up, underpowered hosting, and scripts that load before the content does. On small business sites, compressing images and removing unused plugins is often enough to move the needle from failing to passing.
A reality check on scores: you do not need a perfect 100 in a speed tool. You need real users on real phones to get a fast, stable page. Passing Core Web Vitals matters far more than chasing lab-score perfection.
Indexing: getting the right pages stored
Being crawled is not the same as being indexed. Google decides what enters its index, and technical SEO is how you steer that decision. Noindex tags keep thin, duplicate or private pages out. Canonical tags tell Google which version of a near-identical page is the real one. And Google Search Console shows you exactly which of your pages are indexed, which are excluded, and the stated reason for each.
The goal is not the maximum number of pages indexed, it is the right pages indexed. A site with two hundred sharp, useful pages in the index will outperform one with two thousand thin ones, because index bloat dilutes Google's understanding of what your site is actually about.
The rest of the technical SEO toolkit
Beyond crawling, speed and indexing, a technically healthy site gets a few more fundamentals right. HTTPS everywhere, because a secure connection is table stakes. A mobile-friendly layout, because Google predominantly crawls and judges the mobile version of your site. Clean 301 redirects for any URL you change or retire, so the links and rankings a page earned are carried forward rather than thrown away. And structured data, which labels your content so machines can read it with confidence.
If that sounds like a long list, it is, and that is exactly why the discipline has its own name. The good news is the shape of the work: most technical problems are found once and fixed once. Unlike content and links, which compound through ongoing effort, the technical seo basics mostly need a thorough fix and then light maintenance.
How to find your technical issues
You do not improve technical SEO by guessing. You crawl the site, read the data and work through the list. Our technical SEO checklist walks through every check in the order we run them on client audits: crawlability, indexing, site speed, redirects, structured data and more, with the reasoning behind each one.
Two free tools will carry you a long way: Google Search Console for indexing and crawl errors, and PageSpeed Insights for Core Web Vitals. If the reports come back clean, your foundation is solid and your effort belongs in content and authority. If they come back red, you have found the cheapest rankings you will ever win, because fixing these problems unlocks value your existing pages already earned.
Prefer a done-for-you diagnosis? Run the free audit to see where your site stands, or talk to us about a full technical review with a prioritised fix list.
