Large documents need hierarchy. LaTeX provides deep nesting levels.
Level 1: The Hierarchy
\part(Books only)\chapter(Books/Reports only)\section\subsection\subsubsection\paragraph
Level 2: Table of Contents
Generating a Table of Contents is trivial. LaTeX collects all your numbered sections automatically.
LaTeX
\tableofcontents
\listoffigures
\listoftables
\newpageLevel 3: Cross-Referencing
Never type "See page 5". Use labels.
LaTeX
\section{Introduction} \label{sec:intro}
As mentioned in Section \ref{sec:intro} on page \pageref{sec:intro}...