The Preamble and the Body (example1.tex)

\documentstyle[12pt]{article}

\title{A Sample Document}
\author{Robert Miner}

\begin{document}

\maketitle

This is a sample document.  It shows     how    spaces in the input
file are ingored.  It also illustrates how blank lines spearate
paragraphs.

It also illustrate several other {\em important} things. In
particular, it has some declarations.

\begin{quote}
Declarations are statements
which change the default formatting mode for all text from the command
to the end of the current \em environment.
\end{quote}

\end{document}