When it comes to WordPress SEO, the most essential wordpress plugin to be used is Google XML sitemaps plugin.
Why do I need to create an XML Sitemap?
Google and many other search engines have made it a best practice asking the website owners to create and submit a sitemap in XML format which is readable by their robots. This is because sitemaps help these search engines to index your blog properly.
If you’re unaware of creating WordPress sitemaps manually, here is a simple plugin called Google XML sitemaps that will automatically create an XML sitemap which is compatible with Google, Bing and Yahoo webmaster tools standards.
Once the sitemap is generated, all you need to do is, note the URL of your sitemap (mostly it is http://www.domain.com/sitemap.xml) and submit it to the webmaster tools.
Tip: Insert a link to your XML sitemap from your footer as well as robots.txt file for better indexing.
Download: Google XML Sitemaps