i am a newbie too but to answer your question:
a page is based on a template found in ’manage resources’
the template has placeholders in it for menu’s, blog’s etc.
the page content is pure HTML, it is stored in the database
to assign fields you include PHP code which you put in a ’snippet’, also in ’manage resources’.
the snippet is then called like a function in the content HTML.
the template style is governed by ’site.css’ in the template/default folder
i hope that helps
the docs are very sketchy for newbie’s