Content and links can’t help if crawlers can’t reach your pages. Here’s the prioritized technical SEO checklist every site needs.
What Technical SEO Actually Is
Technical SEO is the foundation layer — the crawlability, indexability, and renderability of your site. It’s the part of SEO a developer can fix. Without it, even great content can’t rank: Google can’t find, understand, or display pages that are technically broken. Fix technical issues first and every other SEO effort gets more efficient.
Crawl and Index
Start with Google Search Console’s Coverage report. Every page you want ranked must be (a) not blocked by robots.txt, (b) not marked noindex, (c) canonicalized to itself (or a logical master), and (d) linked to from somewhere. Fix ‘Discovered — currently not indexed,’ ‘Crawled — currently not indexed,’ and ‘Duplicate without user-selected canonical’ errors first. These silently block ranking on pages you think are live.
Sitemap and Robots.txt
Submit a clean XML sitemap to Google Search Console. Include only pages you want indexed — no noindex pages, no 301-redirected URLs, no canonicalized duplicates. Keep robots.txt conservative: disallow only admin paths and known junk. Don’t accidentally disallow /blog/ or /products/ — we’ve seen both happen on client sites. Always test robots.txt changes in staging before production.
Core Web Vitals
Google uses Core Web Vitals as a ranking signal: LCP (load speed), INP (interactivity), CLS (layout stability). Run PageSpeed Insights on your top pages. LCP should be under 2.5s, INP under 200ms, CLS under 0.1. The biggest wins: compress hero images to modern formats (WebP/AVIF), defer non-critical JavaScript, and fix layout shifts from lazy-loaded images without width/height attributes.
Structured Data (Schema Markup)
Schema markup tells Google exactly what a page is about: product, article, recipe, FAQ, local business. Add Organization and BreadcrumbList schema site-wide. Add Product schema to product pages, Article to blog posts, FAQ to FAQ pages, LocalBusiness if you have a physical location. Validate with Google’s Rich Results Test. Done right, schema earns rich snippets — more screen space in search results, higher CTR.
HTTPS, Mobile, Hreflang
HTTPS is non-negotiable and has been since 2014. Mixed content warnings (HTTP resources on HTTPS pages) still break rankings. Mobile-first indexing means Google ranks your mobile site — if desktop has more content or schema than mobile, you’re penalized. If you serve multiple languages or countries, implement hreflang correctly — it’s the single most broken international SEO element we see.
How to Prioritize Technical Fixes
Rank technical issues by impact × ease. High impact/low effort first: robots.txt errors, noindex on revenue pages, missing sitemap. High impact/higher effort next: Core Web Vitals, structured data, hreflang. Low impact/low effort last: minor crawl budget optimizations, edge-case canonicals. Most accounts find 3–5 critical issues in their first audit that together explain half their missing organic traffic.
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