Time for action – writing a step-by-step tutorial

Let's prepare a tiny "how-to" about designing the page layout:

1. Start with a new document and enter the following code:

   \documentclass{article}
   \begin{document}
   \begin{enumerate}
     \item State the paper size by an option to the document class
     \item Determine the margin dimensions using one of these packages:
     \begin{itemize}
       \item geometry
       \item typearea
     \end{itemize}
     \item Customize header and footer by one of these packages:
     \begin{itemize}
       \item fancyhdr
       \item scrpage2
     \end{itemize}
     \item Adjust the line spacing for the whole document
     \begin{itemize}
       \item by using the setspace package
       \item or by the command \linespread{factor}
     \end{itemize}
   \end{enumerate}
   \end{document}

2. Typeset to generate the «how-to»:

   

What just happened?

We used an enumerate environment. Except for the name, we use it just like the itemize environment; each list item is introduced by the command \item. Again, we nested two lists...