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The point that a lot of newbies miss is that XOOPS is not a CMS (Content Management System).
Xoops is a framework that provides user authentication, DB access, image management, notification subsystem, and other gerneral groundwork for a web application. The modules are the web applications.
To move your static HTML site into XOOPS you need to select one of the excellent content management modules. These content management modules are how XOOPS can be used as a basic CMS. Other modules fill other needs. XOOPS is the framework for all of these web applications(modules), and provides common authentication, DB access, notification system, etc. for them.