\RequirePackage[l2tabu, orthodox]{nag} % nag you about old packages and commands
\documentclass{article}
% Document Classes
% article - basic use
% report - longer reports
% beamer - writing presentations

% Document Class Options
% 10pt,11pt,12pt - size of main font
% twocolumn - typeset two columns

% The LaTeX Font Catalogue - for all types of good alternate fonts
% http://www.tug.dk/FontCatalogue/

\usepackage{graphicsx} % allow importing images
\usepackage{placeins} % use \FloatBarrier for barriers for images to sections
\usepackage[margin=1in]{geometry} % change margins
\usepackage[hidelinks]{hyperref} % make nice URL links, remove decorations
\usepackage{booktabs} % make nicer tables

\pagenumbering{gobble} % suppress page numbering

\title{\LaTeX~Notes}
\author{}
\date{}

\begin{document}

\maketitle

% manual bibliography
\begin{thebibliography}{9}

\bibitem{lamport94} % citation key
    Leslie Lamport,
    \emph{\LaTeX\@: a document preparation system},
    Addison Wesley, Massachusetts,
    2nd edition,
    1994.

\end{thebibliography}

\end{document}

\RequirePackage[l2tabu, orthodox]{nag} % nag you about old packages and commands
\documentclass{article}
% Document Classes
% article - basic use
% report - longer reports
% beamer - writing presentations

% Document Class Options
% 10pt,11pt,12pt - size of main font
% twocolumn - typeset two columns

% The LaTeX Font Catalogue - for all types of good alternate fonts
% http://www.tug.dk/FontCatalogue/

\usepackage{graphicsx} % allow importing images
\usepackage{placeins} % use \FloatBarrier for barriers for images to sections
\usepackage[margin=1in]{geometry} % change margins
\usepackage[hidelinks]{hyperref} % make nice URL links, remove decorations
\usepackage{booktabs} % make nicer tables
\usepackage[T1]{fontenc} % allow pipe character natively + maybe other perks

\pagenumbering{gobble} % suppress page numbering

\title{\LaTeX~Notes}
\author{}
\date{}

\begin{document}

\maketitle

Here is a pipe symbol without doing anything special: |.

% manual bibliography
\begin{thebibliography}{9}

\bibitem{lamport94} % citation key
    Leslie Lamport,
    \emph{\LaTeX\@: a document preparation system},
    Addison Wesley, Massachusetts,
    2nd edition,
    1994.

\end{thebibliography}

\end{document}

Add LaTeX note on pipe character
Add LaTeX note on pipe character
