If you want to put a small piece of text in a specific type style, you can do
it as follows:
If you want to put larger amounts of text into these type styles, you can use
\begin and \end commands; i.e.:
If you want to be able to "stack" type styles (bold and italic, etc), then you need to use slightly different commands:
Not all combinations of styles will have a font associated with them.
More information is available in the document LaTeX on Athena