Web Page (Standard) mode will allow you to create a document body, format text and upload images in a "what you see is what you get" editor window.
Once created, there will be 5 tabbed sections within in the edit page:
Page Content - From this tab you can change the title that appears in the page and edit the content of the page.
Navigation Link - This tab modifies the page's relationship to the navigation tree. As such, it will only be available if editing a page that is assigned to a tree. Note that if the page is related to multiple navigation trees, this tab may change depending on what tree you were in when you clicked the page edit button.
Attach - The Attach tab allows quick upload of files, an image, a video, or embeded content. Note that every function is available within the "page content" tab through the editor and media library. The attach tab is simply a quick and pre-formatted alternative.
SEO - Short for "Search Engine Optimization", this tab contains extra fields to fine-tune your page so that search engines can more easily index it.
Previous Versions - Up to 10 versions of the page are saved. A new version is created every time the page is saved. The oldest version is "pushed out" of the list when there are already 10 versions and the page is saved. Not all data is saved in the previous versions tab, only information for the "Page Content" and "SEO" tabs.