\section,
\subsection, etc.). These commands produce the appropriate
headings and entries in the table of contents, as well as numbering
the divisions. For normal use, you probably want to use
section, subsection, and paragraph. The section
paragraph is different from the command \par. A section
command places the title you give it in bold at the beginning of the
paragraph. The \par command simply marks the beginning of the
paragraph, as would a blank line.
For example, in this document you are currently reading:
\section{Creating Your Document}
... things that are in the section ...
\subsection{Body}
... things that are in the subsection ...
\paragraph{Divisions}
... things that are in the paragraph ...
If you don't want the division to be numbered in the document, include
an asterisk (*) after the division name (e.g. \subsection*{Body}).