Structuring a Long Document

\section{Introduction}
\subsection{Background}
\subsubsection{Prior Work}

A table of contents

\tableofcontents

Placed right after \begin{document}, this automatically builds a table of contents from every \section/\subsection in the document -- no manual page numbers to keep updated as the document grows.

Why This Matters for Your Exams

This is what makes a long write-up (a project, a thesis chapter) navigable -- structure it in sections from the start rather than retrofitting headings onto one long undivided block at the end.