One only needs to know a little HTML and some basic desktop publishing terminology. While the example above only tries to influence one of the properties needed for rendering an HTML document, it qualifies as a style sheet on its own. The selector is the link between the HTML document and the style, and all HTML tags are possible selectors. The 'color' property is one of around 40 properties that determine the presentation of an HTML document. It's always important to keep the user in mind.
Different users require different tools.
Converters and language oriented authoring tools will help the moderately experienced author cope with conversion headaches and large quantities of text. Complete lack of originality. He's likely there because he has something of importance to say. Whatever it is will likely be boring or far too technical for you. More data about the daily life of a kindergartner than you thought possible.