If you are building a website and are looking to improve hit rates, the following are useful to get better SEO ranking:
To generate Sitemap.xml : https://www.sureoak.com/seo-tools/google-xml-sitemap-generator
To generate Robot.txt : https://www.sureoak.com/seo-tools/robots-txt-generator?websiteId=0
Search engine bot simulator: https://www.xml-sitemaps.com/se-bot-simulator.html
Validate Sitemap: https://www.xml-sitemaps.com/validate-xml-sitemap.html