Learn how you can use a sitemap and other methods to tell Google about all of the different language and regional versions of your pages.| Google for Developers
The Root Zone Database represents the delegation details of top-level domains, including gTLDs such as| www.iana.org
Robots.txt is used to manage crawler traffic. Explore this robots.txt introduction guide to learn what robot.txt files are and how to use them.| Google for Developers
When a site has duplicate content, Google chooses the canonical URL. Learn more about canonical URLs and how to consolidate duplicate URLs.| Google for Developers