There are several effective SEO extensions available for Magento. We often recommend using extensions like SEO Suite Ultimate, Mageworx SEO Suite, and Amasty SEO Toolkit. These extensions offer features such as advanced meta tag management, canonical tags, structured data markup, rich snippets, XML sitemap generation, and optimization of product pages, categories, and URLs. Additionally, tools like Google Analytics and Google Search Console integration are essential for tracking website performance and identifying optimization opportunities.