Technical SEO is the foundation work that ensures search engines can access, crawl, render, and index your site without obstacles. While content and links get more attention, technical issues will cap your rankings no matter how good your content is. The core components break into three areas. First is crawlability and indexing: XML sitemaps, robots.txt configuration, proper use of noindex tags, canonical tags to prevent duplicate content issues, and ensuring your server responds reliably with correct status codes. Second is site performance: Core Web Vitals (LCP, CLS, INP), page speed optimization through compressed images, minified code, browser caching, and CDN usage. Third is structure and security: HTTPS implementation, mobile responsiveness, logical URL hierarchy, proper redirect chains (301s not 302s), and hreflang tags for multi-language sites. Structured data markup (Schema.org JSON-LD) deserves special mention because it helps Google understand your content type and can trigger rich results in search. For local businesses in Ottawa or Toronto, LocalBusiness schema with accurate NAP data directly impacts map pack visibility. Common technical problems we fix regularly include: - Orphaned pages with zero internal links - Redirect chains eating crawl budget (A→B→C instead of A→C) - Slow server response times above 600ms - Mobile usability errors flagged in Search Console - Missing or broken canonical tags creating indexation confusion - JavaScript rendering issues where content invisible to Googlebot At Ottawa SEO, technical audits start with Search Console and Screaming Frog crawls across our 500-domain portfolio. We prioritize fixes by impact: a site-wide HTTPS issue gets handled before optimizing one image. For ecommerce sites, technical SEO also means faceted navigation that doesn't create infinite URL parameters and proper handling of out-of-stock product pages. The tradeoff is technical SEO requires ongoing maintenance, not one-time fixes. Google's algorithm updates, Core Web Vitals thresholds, and your own site changes mean quarterly technical audits make sense for any site doing over 10,000 monthly organic sessions.