By default there’s only two types of content: posts and pages. Posts contain all the usual bloggy stuffs (date, by, category, etc.), and pages contain only the title. You can create a page by clicking on the Pages > Add New link in the WordPress admin.
There’s also two templates for pages, one is the default 2 columns layout and another is a one column layout without the sidebar. See here on how to change it: https://forum.graphene-theme.com/topic/one-column#post-56
There is no different heading styles to be selected. That you have to customise yourself. If you’re talking about Custom Header, go to Appearance > Header.