Why Google indexing first of all meta title and not URL while we submitted sitemap.xml in webmaster tools of google.

sitemap which one help to crawl your website easily

yes sitemap could be helpful for user to read about the site.

Yes, Sitemap is Very useful for All Search Engine Robots, and Get your site All page Indexing in Search Engine.

Sitemap refer map of a websites. It contains the structure of the sites, its section, the link between them etc. On a single page. And sitemap is important for website because sitemap is a easy way for webmaster to tell the search engine and user the websites structure

there are two type sitemap xml and html. xml site map is helpful for crawling your website by search engine and html sitemap helpful for visitor, its provide all link of the website at one page so visitor can get any link in easy way.

Sitemap is tell everything about your website.
sitemap threw easily show website's webpage
detail and when google crawler come to crowl
this page this can easily take information and
crowl all content.this is one type of easy way
for webmasters to inform search engines about
pages on their sites that are available for crawling.
and google generate dofollow backlink.

Because your webpage is crawl easily in the Search Engine by Sitemap.