Compile and preview the letter. Next, modify letter.tex
— add a sentence or two to the main letter content — then
compile again and refresh your preview.
Modify the file lists.tex to produce a list of lists of lists
— experiment with the three list environments (bullets, numbered
and titled); compile and preview.
First, compile it — twice — and preview it. Notice the
table of contents. Add some sections, subsections and subsubsections of
your own, then re-compile and refresh your preview.