Normal is normal text, default. With Headings a big return is placed between the first single return, after the return normal font defaults. Address is an italic font. List Item is a bulleted list. Title is similar to normal, and Desc.
Text is indented.
You may also change fonts and font size manually using tool bar. This should say Variable Width. This is the style of font, similar to Word. The difference between variable and fixed width is that variable is the default width of text and fixed has each charter of pretty much equal width. The other fonts are the same as Word.