Custom Pages are great for adding extra information to the platform that does not fall under any of the modules or default pages. You can use a custom page as, e.g. an “About” page introducing your project, a “History” page about your company, embed a custom HTML document inside the existing HTML document, or add any other information that you want to provide your community with.
We are talking about adding static content here. Comments are not supported on custom pages.
You can display content from a third party website with the iframe option.
Read this article to find out how you can add a custom page to your navigation menu.