Technical SEO covers everything that helps search engines crawl, understand, and index your site without friction. It's infrastructure work, not content or links. The core components: site speed and Core Web Vitals (LCP, CLS, INP), mobile-friendliness and responsive design, XML sitemaps and robots.txt configuration, HTTPS and security certificates, structured data (schema markup for rich snippets), canonicalization to prevent duplicate content issues, and proper URL structure. You're also managing crawl budget for larger sites, fixing broken links and 404 errors, implementing redirects correctly (301 vs 302), setting up hreflang tags if you operate in multiple languages or countries, and ensuring your server responds reliably with proper status codes. Log file analysis matters for enterprise sites to see what Googlebot actually does versus what you think it does. Indexability controls are critical. That means meta robots tags, X-Robots-Tag headers, and noindex directives where needed, plus managing pagination, faceted navigation, and parameter handling so you're not wasting crawl budget on junk pages. JavaScript rendering is another layer—if your site relies on JS frameworks, you need to confirm Google renders it properly or implement server-side rendering or pre-rendering solutions. At Ottawa SEO, we run technical audits across our 500+ domain portfolio monthly. Common issues we catch: redirect chains eating speed, orphaned pages with no internal links, mixed content warnings blocking HTTPS, and schema errors that kill rich snippet eligibility. A site can have perfect content and strong backlinks, but if Googlebot hits 5-second load times or can't parse your navigation, you're leaving 30-50% of potential traffic on the table. The tradeoff is time versus impact. Fixing Core Web Vitals on a bloated WordPress site might take 40 hours and yield a 15-25% traffic lift. Cleaning up a messy sitemap takes two hours and prevents indexation disasters. Prioritize what's blocking Google first, optimize for user experience second. Technical SEO isn't glamorous, but it's the difference between a site that ranks and one that doesn't get crawled properly in the first place.