In its simplest form, Website XML Sitemaps are an easy way for webmasters to inform search engines about pages on their sites that are available for crawling. The Sitemap XML file lists URLs for a site along with other metadata about each URL (when it was last updated, how often it changes, and how important it is, relative to other URLs in the site) so that search engines can more intelligently crawl the site.
Blog SEO is the practice of optimizing a blog's content, site architecture, and HTML code for search engines. Common tasks associated with blog SEO include on-page optimization, installing plugins, improving page loading speed, and internal linking.
Tags & Categories in WordPress are something that you will always find in the right sidebar when writing or editing a post. But there’s more to the topic than just that. Categories and tags have much more significance when it comes to the content organization on your site, as well as SEO.