Sitemap is very important in SEO, It helps crawler index website pages and gives a root map to visit the site.
Yes, sitemaps are still a vital part of SEO. A sitemap is a file that lists all the pages on your website and provides additional information about each page, such as when it was last updated and how important it is in relation to other pages on the site. Sitemaps are used by search engines to discover and crawl new and updated pages on your website, so having a sitemap can help ensure that all the pages on your site are found and indexed by search engines. There is no hard and fast rule for how often you should resubmit your sitemap, as it depends on how often you update your website. If you make frequent updates to your site, you may want to resubmit your sitemap more often to ensure that search engines are aware of the updates. On the other hand, if you only make occasional updates to your site, you may not need to resubmit your sitemap as frequently. In general, it is a good idea to resubmit your sitemap whenever you make significant updates to your site or add new pages. You can also use tools like Google Search Console to monitor the status of your sitemap and see if there are any issues that need to be addressed.