When you want to display a module on another page, you have two options:

Add Existing Module: This creates a reference to the original module. Any changes made to the module's content on any page will be reflected across all pages. This method is ideal for displaying shared content (such as a contact form or news) on multiple pages.

Copy Module: Copying creates a completely independent and new version of the module and its content. Changes to the copied module will not affect the original. This method is suitable when you want to use the structure of a module as a template but place different content in it. To copy, go to the module settings, open the Advanced tab, and select Copy Module.