Setting labels and references

To be able to refer to a certain point, we have to mark it with a label. The name of that label will serve us afterward for referencing.

We will now typeset a list of the most used packages for papers, according to a survey on https://latex.org. Through the \label command, we will mark items that we can later refer to with the \ref command, as shown here:

1. Create a new book document:

   \documentclass{book}
   \begin{document}

2. Start a chapter and a section, and place a label for this section:

   \chapter{Statistics}
   \section{Most used packages by LaTeX.org users}
   \label{sec:packages}

3. Continue with some text, including a footnote:

   The Top Five packages, used by LaTeX.org
   members\footnote{according to the 2021 survey on
   LaTeX.org\label{fn:project}}:

4. Write an enumerated list and put a label on a few items for referring to them:

   \begin{enumerate}
     \item graphicx\label{item:graphicx}
     \item babel
     \item amsmath\label...