Can it be need to update google sitemaps often? How often do you update your sitemaps? Best regards! Yummy
There is no need to update your sitemap.xml file. One thing, when you add a new page then you can add this page url in sitemap.xml file and upload at the same root directory.
Yes and No, you need to update if there any changes to Content/New Pages. No Need to update if there is No Change in your site.