Use the Sitemaps report to tell Google about any new sitemaps for your property, to see your sitemap submission history, and to see any errors that Google encountered when parsing your submitted sitem| support.google.com
Learn how to combine different kinds of sitemap extensions in one single XML sitemap.| Google for Developers
A sitemap provides information that helps Google more intelligently crawl your site. Discover how a sitemap works and determine if you need one.| Google for Developers
Index your news article, images and videos via specialized sitemaps.| www.stefanjudis.com
Learn what crawl budget is and how you can optimize Google's crawling of large and frequently updated websites.| Google for Developers
Google supports several sitemap formats. Follow this guide to learn about formats, how to build a sitemap, and how to submit a sitemap to Google.| Google for Developers