What Is SEO (Search Engine Optimization) & AI Search (GEO)? The Complete Modern Web Engineering Guide | Find the help and practical guides you need. — Fantatree — Technical SEO begins with clean crawlability, sub-2.0s Largest Contentful Paint (LCP), and deterministic canonical URLs. Multilingual sites must pair locale-prefixed URLs (/:locale/) with reciprocal hreflang tags and x-default fallbacks. Generative Engine Optimization (GEO / AEO) relies on semantic HTML headings, explicit comparison tables, and Schema.org JSON-LD entities.