Technical SEO
Technical SEO is the work that makes content findable, indexable and fast. Great content on a technically broken site does not rank, which is why this comes first in any audit.
Stuck at any point? Ask an AI about this page →What Technical SEO Covers
Four broad areas. Whether search engines can reach your pages — crawling, robots directives, site architecture. Whether they can index them — canonicals, duplicate handling, rendering. How well the pages perform — Core Web Vitals, load speed, mobile. And how clearly they communicate meaning — structured data, hreflang, semantic markup.
Where to Start
Work in order of dependency. A page that cannot be crawled will never be indexed, and an unindexed page cannot be slow or fast in any way that matters. Begin with crawlability and indexation, then duplication, then rendering, then performance, then structured data.
The audit guide in this section sets out that sequence in full.
All 15 guides in this section
- CLS Optimisation: The Complete Technical Guide
How to diagnose and fix Cumulative Layout Shift. Images without dimensions, ads, web fonts, dynamic content injection — every CLS cause and fix explained. - Duplicate Content and Canonicalisation
How duplicate content arises, what Google actually does about it, and how canonical tags, parameters and redirects resolve it correctly. - Hreflang: Complete Guide to International SEO
Complete hreflang guide — implementation via HTML tags, HTTP headers, and XML sitemap; x-default; self-referencing; common errors; how Google uses... - HTTPS and Security Signals
Why HTTPS is a ranking signal, how to migrate without losing rankings, and the security headers that signal a trustworthy site. - INP Optimisation: The Complete Technical Guide
How to diagnose and fix Interaction to Next Paint. Long tasks, main thread blocking, JavaScript execution, event handler optimisation — every INP fix explained. - JavaScript SEO: How Google Crawls and Indexes JS
How Googlebot crawls and renders JavaScript, the two-wave indexing delay, dynamic rendering, fixing crawlability issues in React/Vue/Angular, and how... - LCP Optimisation: The Complete Technical Guide
How to diagnose and fix Largest Contentful Paint. Every LCP sub-part explained — TTFB, resource load delay, resource load duration, render delay — with... - Log File Analysis for SEO: The Complete Guide
How to use server access logs to understand Googlebot crawl behaviour, crawl budget, crawl frequency by URL type, and discover indexing problems before... - Mobile SEO
Mobile-first indexing, responsive implementation, mobile page speed and the specific mobile issues that cost rankings and conversions. - Page Speed Optimisation: Complete Technical Guide
Complete page speed optimisation guide covering HTTP/2, compression, resource hints, image optimisation, critical rendering path, and third-party... - Schema Markup: The Complete Technical Guide
Complete schema markup guide — JSON-LD implementation, every rich result type, testing with Rich Results Test, common errors, and how structured data... - Site Architecture for SEO
URL structure, click depth, hierarchy and internal linking — how site architecture distributes authority and signals what content matters. - Server-Side Rendering vs Client-Side Rendering
SSR vs CSR vs SSG vs ISR — a complete comparison of web rendering strategies for SEO, Core Web Vitals, and developer experience. When to use each approach. - Technical SEO Audit Methodology
A systematic process for auditing technical SEO — what to check, in what order, which tools to use, and how to prioritise the fixes you find. - TTFB: Time to First Byte — Complete Guide
What TTFB measures, why it is the foundation of LCP, how to diagnose high TTFB, and every server-side fix — CDN, caching, Early Hints, HTTP/2, database queries.