When you set the page type to article you get an Article page type. Article pages are generally for writing essays that are free-form but convey facts, and serve to provide the reader with information that is not well represented with diagrams. For essays that do not necessarily convey facts, the Opinion page type is more suitable, and for pages that are for conveying information through less text and more graphics, diagrams or in structured lists, the Manual page is more suitable.
The main characteristic of an Article page is that the first letter of each paragraph will be enlarged just like the Opinion page page. When creating paragraphs, you add two spaces in the beginning of the paragraph to indicate that this is a paragraphed text block, and it will magnify the first capital. Use this to signify that this is the beginning of a minor section.