Technical SEO is the foundation on which all other SEO efforts rest. Without it, even the best content and strongest backlink profile will underperform. Technical SEO issues prevent search engines from effectively crawling, indexing, and ranking your pages—and many sites have multiple active issues simultaneously, each one compounding the effect of the others. This guide covers the issues most commonly found in SEO audits and the specific steps required to resolve them.
Crawlability Problems
Search engines can only rank pages they can crawl. Crawlability problems prevent Googlebot from reaching and processing your content, which means affected pages will not appear in search results regardless of their quality. Common crawlability blockers include:
- Robots.txt misconfigurations: Overly restrictive rules that block crawlers from important sections of the site. Audit your robots.txt and verify that key directories (CSS, JavaScript, image assets needed for rendering) are not blocked. Use Google Search Console’s robots.txt tester to validate rules.
- Noindex directives on important pages: Meta robots noindex tags or X-Robots-Tag headers on pages that should be indexed. Perform a crawl with Screaming Frog and filter for pages with noindex—then verify each is intentionally excluded.
- JavaScript rendering failures: Content that is only available after JavaScript execution may not be crawled. Use Google Search Console’s URL Inspection tool to compare crawled vs. rendered page content for JavaScript-heavy pages.
Indexation Errors
Even pages that can be crawled may not be indexed if Google determines they don’t meet its quality thresholds or if technical signals suggest they shouldn’t be indexed. Common technical SEO issues in this category include:
Duplicate content: Multiple URLs serving substantially similar content dilute link equity and create crawl budget waste. Common causes include HTTP/HTTPS versions, www/non-www versions, URL parameters, and pagination without proper canonical tags. Implement canonical tags to consolidate signals to preferred URLs and configure 301 redirects where appropriate.
Soft 404s: Pages that return a 200 HTTP status code but contain little or no meaningful content. These waste crawl budget and pollute your index with thin content. Resolve by adding content to these pages or returning a proper 404 or 410 status. Discovered but not indexed: Pages Google knows about but has chosen not to index, usually due to perceived thin content or quality issues. The fix requires improving page content quality or consolidating thin pages.
Site Speed and Core Web Vitals
Technical SEO issues related to page speed are among the most impactful to fix because they affect both ranking signals (Core Web Vitals are a confirmed Google ranking factor) and user experience. Priority speed improvements include:
- Optimize images: compress, resize to display dimensions, and serve in WebP format
- Eliminate render-blocking resources: defer non-critical JavaScript and load CSS efficiently
- Implement caching: browser caching, server-side caching, and CDN caching for static assets
- Reduce server response time: upgrade hosting tier, implement a CDN, or optimize database queries
- Minimize JavaScript bundle size: audit for unused libraries and implement code splitting
Broken Links and Redirect Chains
Broken internal links (404s) waste crawl budget and create dead ends in your site’s link graph. Redirect chains (multiple sequential redirects before reaching the final URL) dilute link equity with each hop and slow page loading. Google will follow up to five redirects in a chain, but best practice is a maximum of one redirect—direct to the final destination URL. Audit redirect chains with Screaming Frog and update internal links to point directly to canonical URLs.
Schema Markup and Mobile Usability
Schema markup enables rich results (star ratings, FAQ dropdowns, product prices, event dates) that significantly increase click-through rates in the SERP. Pages with rich results consistently earn more organic clicks than equivalent pages without them. Implement schema markup appropriate to your page types and validate all schema with Google’s Rich Results Test.
Google’s mobile-first indexing means the mobile version of your site is what Google crawls and indexes for ranking purposes. Mobile usability failures—text too small to read, clickable elements too close together, content wider than the viewport—directly affect rankings in addition to user experience. Addressing all reported technical SEO issues around mobile and monitoring Core Web Vitals field data in Search Console will confirm improvements are reflected in real-user measurements.
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