Automatically update sitemap in Server File

Can Any One Suggest me How i can Automatically generate sitemap.
i want to more crawl my Website and grow my google rank on first page.
how it can possible.

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What exactly are you asking @posddhan12? There seem to be three unrelated questions here.

Welcome to the forums, @posddhan12.

Have you had a look at Google’s guidance on creating sitemaps?

Actually i want to know sitemap and how it work.

yes and much more regarding it

If you’ve already looked at the article, and other resources, then what is it specifically that you don’t understand and need help with?

if you are using wordpress, you can install yoast seo plugin. It will automatically generate sitemap