\documentclass[12pt]{article}
\title{A Simple Sample $\text{\LaTeX}$  Document}
\date{}

\usepackage{amsfonts}
\usepackage{amsmath}


\begin{document}
\maketitle
\vskip-2cm

%\pagestyle{myheadings} \markright{A Simple Sample \LaTeX document}

\begin{itemize}
  \item All commands begin with a backslash (ex. $\backslash$\!tilde$\{a\}$)

  \item Necessary attributes live inside $\{ \}$

  \item Optional attributes live inside [ ]
  (e.g. \verb/\documentclass[12pt]{article}/) 
  
  \item Enter or any number of spaces is equivalent to a single space.
      A blank line of text indicates a new paragraph.
\end{itemize}


\end{document}