SEO is the discipline of getting pages to rank in search engines — primarily Google, increasingly Bing-via-ChatGPT-Search, Perplexity, and the emerging AI-search engines. The category has shifted significantly from the keyword-density and link-building era into something closer to product strategy: build content people actually find useful, ship pages that Google can crawl and render correctly, and earn links by being the canonical resource on a topic.
The technical SEO layer (Core Web Vitals, structured data, sitemap hygiene, indexation diagnostics in Search Console) is what engineers can directly improve. Content strategy and link building are the parts most engineers can support but rarely own end-to-end. Courses in this category mix all three audiences — engineers, content marketers, and founders.