How to properly set up redirects to another domain?

Question

Google

There is a domain in the .com zone, I registered the same one in the .ru zone
How to set up redirection for search engines correctly?
What answer to give?
What to write in robots.txt
What to give nginx from the old one?
PS Are there cheap registrars in .com (+ extension of rubles up to 300?)

Answer 1

First, decide from which to which redirection.
It would be logical not to touch the old one, but redirect it from the new one to the old one.
Redirect everything except robots.txt to a new 301 redirect.
On the old one, give robots.txt, in which host: points to the new one.
In Yandex.Webmaster, you can additionally specify that the site be moved to a new domain.
301 redirect
The main thing is to specify the final Host:
https://yandex.ru/support/webmaster/yandex-indexin...