How is Magento SEO different from regular SEO?

Three things make it different: (1) URL bloat — layered nav, search results, sort/order params can balloon the index by 10× if not handled. (2) Multi-store / multi-language — hreflang, canonicals across store views, and per-locale URL rewrites are non-trivial. (3) The product/category split — you have category pages competing with product pages competing with CMS pages for the same keywords. Generic SEO advice (“publish blog posts”) doesn’t cover any of this. Magento SEO is mostly a technical problem before it’s a content problem.