SEO in your site’s code and layout means making sure everything’s set up so search engines can easily find and understand your content. That means using the right HTML tags like H1s and H2s to organize stuff, cleaning up your code so pages load faster, and adding meta tags to explain what each page is about. Your code also needs to work well on phones and be responsive so Google sees it as mobile-friendly. All of this is part of technical SEO, and it helps your site show up higher in search results.