Site Map contains URL of webpages with this web crawlers can easily find the links and there are two types of Site Maps:
1. XML site map for search engines
2. html site map for users to find the pages easily
For latest SEO Strategy, First Focus on On Page Optimization like title, description, quality content, site map etc.
After that focus on Off Page Optimization, getting Back links from related sites, posting ads, videos etc.
Dont know exactly, but concentrate on some On Page techniques like Title, Description, Content, Images, Alt Tags etc and do some user engagement activities in your site.