Robots.txt and sitemap.xml creating and proper configuration

As part of this kwork I will configure 2 very important files for each website on any CMS - robots.txt & sitemap.xml

What are these files for?

robots.txt is a directive specifying the rules for indexing the website for different search robots (which sections and pages to index & which not);

sitemap.xml - a site map that contains & structured links to all available HTML-pages of the website to make it easier for search robots to understand its structure and crawl the website.

robots.txt:

1. I will specify the rule User-agent for all the important search robots (Yandex, Google, general rule, etc. )
2. Remove parameter Host, which does not work.
3. Write path to a sitemap
4. Cover JS-scripts & CSS-styles for Yandex
5. . Close all 404 errors & broken pages
6. Check the validity of everything

sitemap.xml:

1. Configure the correct sitemap with only the right pages
2. All structured and set the correct priorities for all pages
3. Check for validity

I work with WordPress.