Time for action – listing packages by topic

We shall refine the package list by introducing categories:

1. Refine the aforementioned highlighted itemize environment of our example in the following way:

   \begin{itemize}
     \item Page layout
     \begin{itemize}
       \item geometry
       \item typearea
     \end{itemize}
     \item Headers and footers
     \begin{itemize}
       \item fancyhdr
       \item scrpage2
     \end{itemize}
     \item Line spacing
     \begin{itemize}
       \item setspace
     \end{itemize}
   \end{itemize}

2. Typeset to see the new list:

   

What just happened?

We simply inserted another list inside the list. Up to four levels are possible, otherwise LaTeX would stop and print out the error message ! LaTeX Error: Too deeply nested. As we saw, the first level is marked by a bullet, and the second by an en dash. A third level item would start with an asterisk symbol *. The fourth and last level would be marked by a centered dot.

Deeply nested lists can rarely be seen; such complicated structures might be hard to read....