With WordPress SEO Plugin by Yoast you are able to improve your site
Plugin from Yoast is a dead-simple SEOplugin that helps your posts perform better in search engine results because you write better content and have a fully optimized WordPress site using the WordPress SEO. Continue reading →
If you want to test WordPress themes, than can do that with Theme Check plugin. That plugin is a great theme development tool and an easy way to test your all WordPress theme and make sure it’s up to spec with best practices and review standards. With it, you can run all the same automated testing tools on your theme that WordPress.org uses for theme submissions.