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Brick & mortar store

If you sell online only, it is not as important to put your physical address but it can build some trust
If you have a physical retail store, add the physical address of your store(s).

Components

Show a professional email address, such as info@yourstore.com.
In order to reduce the amount of spam you get, you should either put the email as an image, or protect it with a script.
You could also add a button to trigger the Live Chat (even if you have a floating button for it), in case they didn’t notice it down there.
Put a contact form (in addition to an email address). Having both is ideal.
If you opt for a Help page instead of a Contact page, then a FAQ is a good thing to add to that page.

So I think that the ‘ideal’ Contact / Help page should contain these components: