after creating an additional domain additional.com, it will be available as a subdomain of main.com, i.e. typing in the address bar of the browser additional.com or additional.main.com you will see the same page. The question is whether this is a problem for search engines. identical content that is available at different URLs. ???

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    Duplicate content may create problems for your site. A possible solution: use the rel = canonical attribute to specify the preference / primacy of your web pages. Help Google . The main requirement for duplicate content is to use the search rank without manipulation or fraudulently attract users to a website. For example: a mobile version of a website or a print version. This Google documentation describes how to tag duplicate content for the mobile version of the website. Help Google Repetitive content .