Technical SEO is the layer everything else depends on. The 2026 baseline \u2014 crawlability, indexability, rendering, Core Web Vitals, schema markup, on-page hygiene, and AI engine crawl access \u2014 covered as one integrated foundation.
SEO in 2026 is the foundation underneath Generative Engine Optimization, not the endpoint. The 2026 playbook — six fundamentals that anchor everything, three new layers above (GEO, Citation Share, cross-engine distribution), Wikipedia and Reddit as retrieval anchors, and the cross-engine measurement stack.
Mobile-first indexing completed 2023. Core Web Vitals matured. Mobile traffic 60%+ of total web. The 2026 mobile web environment — LCP, INP, CLS, AI engine integration.