You spent three weeks building a beautiful React SPA. You deployed it. You Googled it. Google returns nothing. Or worse, it crawls your page and indexes <div id="root"></div> . This isn't a bug. It's the fundamental tension between how React works and how search engines crawl the web. Client-side rendering hands the browser a blank HTML shell and says "figure it out." Googlebot sometimes does. Bing mostly doesn't. And "sometimes" is not an SEO strategy. Server Side Rendering (SSR) in React solves this at the source, but the implementation details trip up a lot of developers. Let's fix that. What Actually Happens During CSR vs. Server Side Rendering in React Before writing a single line of code, it's worth being precise about the difference.…