Generate XML Sitemap is important for your website however it for blogger or WordPress.
You must have to create it and placed it in the main directory for your website.
so that the search engine crawl your site and all of your webpages for indexing.
Generate XML Sitemap for your new blogger website step by step:
Type in google search labnol or go directly on this link.
Copy your full blogger website URL and paste it into the box and click on Generate Sitemap.
Now your XML Sitemap is successfully generated
Select all your generated sitemap text and copy it.
Go back to your blogger setting and then subsetting crawlers and indexing.
In crawlers and indexing click on Custom robots.txt.
and paste all your Generated XML Sitemap text here in the Custom robots.txt section
and click save.
Now, all done.