The macros know about these major portions of a book: chapters, appendices, sections, subsections, exercises; the preface, table of contents and index are created like chapters or appendices, but require some extra handling. To start a chapter, appendix, section, or subsection, use one of these:

\chapter{Title of Chapter}{pdf bookmark title}
\appendix{Title of Appendix}
\unletteredappendix{Title of Appendix}
\section{Title of Section}{Running section title}{pdf bookmark title}
\subsection{Title of Subsection}

Each of these macros will cause an entry of the appropriate type to appear in the table of contents. Chapters will be numbered consecutively; appendices will be lettered starting with "A'', except those produced with \unletteredappendix; sections will be numbered as "cn.sn''—that is, with chapter number (or appendix letter) and section number; and subsections will be numbered as "cn.sn.ssn''—that is, with chapter number (or appendix letter), section number, and subsection number. Section numbers start at 1 with each chapter; subsection numbers start at 1 in each section. The second parameter to \section, the "Running section title,'' will appear in the header on right hand pages. If it is empty, the section title will be used. This would typically be used if the actual section title is quite long.

The "pdf bookmark title'' is used for the bookmark title in the pdf file; if blank, the title (or running title, in the case of \section) will be used. This can be used if the normal title contains special processing characters, like math mode, which won't be interpreted properly for the bookmark text.

1.1.1 Subsections

Subsections are pretty much like sections, except that by default they do not appear in the table of contents. To make them appear in the table of contents, include the following definition in your file before you input the macros:

\def\subsectionsintoc{true}