On a project, there is two different URL, that has a lot of the same content. As an example, let's say:
https://second-url.example/text/my-post page has defined
<link rel="canonical" href="https://first-url.example/text/my-post" /> to suggest to Google that
first-url.example URLs should be preferred in Google search results etc.
What should I do or how should I think about what to put in
sitemap.xml on the
second-url.example site? Should it be the same as the canonical URL, or should it just point to it's own URLs? How should I think about this?