how to update sitemaps after you change your content

Say, I were to delete or combine few pages, should I resubmit sitemap to Webmaster Tools, or is it OK to just update the human-readable page onsite.   I'm wondering if it's sufficient enough for GoogleBot to crawl in terms of updating for SERPs as well when doing site example com search for pages that are indexed to gain understanding of what pages have not been crawled...   Therefore, Google will find them eventually..   HTML sitemap will speed up that process because Google's crawler looks for HTML sitemap when it comes to your site..   XML sitemap will speed up the process bit more because Google Search Console tells the crawler exactly where to look for the important pages on the website and even ranks them order ..   then you can choose whether it's necessary to resubmit your sitemap..   By submitting temporary sitemap that contains all of your original pages that redirect to their new location, such as with website redesign or redevelopment, you can help Google get those changes faster..   many SEO pros have found that by encouraging Google to crawl the old pages and see the redirects, their pages are updated more quickly in Google index..   Anytime you make changes, you will see your errors and your crawl stats jump up..   So, to answer the question, you do not have to do anything when you make changes.   Read more