The Resource Tree in the left column will organize your pages (referred to as "resources"). For example, you could have this structure:
Home
About Us
Department 1
---- Home 1
---- News 1
-------- Post 1
-------- Post 2
Department 2
---- Home 2
---- News 2
-------- Post 1
-------- Post 2
Contact
An example of this is a site I'm managing
http://deafbusiness.org While this site is done in Evo, the resource structure will work in the same way for either Revo or Evo.
There are several resources that are the same for both parts of the site, usually reflected within the main sections with "weblink" resources for linking purposes, and two "container" resources to act as parents for the two site sections. In that top level, only the two main sections are set to show in the menu, to provide the two main links in the "landing" page. However, obvious unchanging "menus" like that don't always have to use a menu snippet like Wayfinder; they can be hard-coded when they aren't going to be dynamic. For example, the two menus at the very top of the pages are hard-coded in HTML.
With Revo, you also have "contexts" for separating sections of a site, but that's something I've never investigated myself.
http://rtfm.modx.com/display/revolution20/Contexts While contexts are frequently described in terms of subdomains, they are also useful for multiple language sites or sub-sites of any kind. For example, if I had used Revo for building the deafbusiness site, I would have three contexts, the default context for "global" site content including the landing page and the registration page, one for Orlando and one for San Diego.
[ed. note: sottwell last edited this post 14 years, 5 months ago.]