1. After moving 301 redirects

If you change domain of your site, you should redirect from old domain to new domain with 301 error.

Why do we need a 301 redirect?

It is needed so that Search Robots know that your site domain changed.
Search Engine’s index of your site will be smooth changed from old url to new url by 301 error.
If you do not notify Search engine that your site changed domain, Search engine will know that your new domain is new site. And Search Engine’s indexes of your old domain will be erased.