Yoast SEO is a well known and number 1 SEO plugin for WordPress website. There are 2 versions available for this plugin Yoast SEO (Free version) and Yoast SEO Premium (Paid version). Yoast SEO works perfectly on all types of wordpress websites or blogs for SEO purposes. Yoast SEO premium has some nice to have features that help you to write better and fully optimized content for search engines. The free version of this plugin also has tons of amazing features to increase your site presence in search engines, but if you need more advanced features, then you must go for the premium version.