The content module is the "catch-all" module of the CMS. Other CMS modules are built for a specific purpose in mind, but the content module is a free-form editor which will allow you to do just about anything. The more skilled you become with this module, the better your site will look.
Since the content module uses an HTML editor, if you become familiar with creating content using other programs (e.g. Adobe Dreamweaver), then you can simply paste the HTML directly into the editor.