How to Add and Manage Ads in XenForo?

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Hi, I am planning to integrate advertising on my XenForo forum and I need some clarification:

How can I properly add banner ads? Is there a recommended way to insert ad code using the built-in XenForo system?
Is it possible to display pop-up ads, interstitials, or floating/sticky ads? Do I need an add-on for that, or can it be done through templates or default options?
Is there any way to manage ads separately for desktop, tablet, and mobile users?
Can I restrict ads for...