You know the seo is very important for any website, you can get best plugin from Yoast SEO plugin
WordPress out of the box is already technically quite a good platform for SEO. This was true when Joost wrote his original WordPress SEO article in 2008 (updated every few months) and it’s still true today.
Premium Support The Yoast team does not always provide active support for the Yoast SEO plugin on the WordPress.org forums. One-on-one email support is available to people who bought the Premium Yoast SEO plugin only. Note that the Premium SEO plugin has several extra features too, including the option to have multiple focus keywords and a redirect manager, so it might be well worth your investment!
you can download from here