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Footnotes
Basic footnotes
In almost every document you will need footnotes, so this article explains how to add them. In Latex there is a simple command \footnote which automatically numbers it.

CODE
\documentclass{article}
\begin{document}

\section{Footnotes}

This is a test to check if the footnote\footnote{it works} works.

\end{document}


The superscript for the footnote can be modified manually using an option like this, which sets "10" as the reference mark:

CODE
\documentclass{article}
\begin{document}

\section{Footnotes}

This is a test to check if the footnote \footnote[10]{it works} works.

\end{document}


Another command is \footnotetext{} which prints the footnote corresponding to the previous \footnotemark. The latter prints a foot note mark but without the actual footnote. This can be used to write the actual footnote text in a new line:

CODE
\documentclass{article}
\begin{document}

\section{Footnotes}

This is a test to check if the footnote \footnote[10]{it works} works. The footnote text\footnotemark can be written in a new line. \\

\footnotetext{second footnote}

\end{document}


Footnotes with more references
A single footnote can be used multiple times:

CODE
\documentclass{article}
\begin{document}

\section{Footnotes}

This is a test to check if the footnote \footnote[10]{it works} works. The footnote text\footnotemark can be written in a new line.

\footnotetext{second footnote}

The same footnote\footnotemark can be repeated more than once\footnotemark[\value{footnote}].

\footnotetext{the same footnote}

\end{document}

A footnote can be labeled too:

CODE
\documentclass{article}
\begin{document}

\section{Footnotes}

This is a test to see if the footnote\footnote{\label{test}first} label works.

\end{document}

If you want to refer them later in the document you can use the \ref{} command:

CODE
\documentclass{article}
\begin{document}

\section{Footnotes}

This is a test to see if the footnote\footnote{\label{test}first} label works.\\
I want to refer to a footnote\ref{test}.

\end{document}
Numbering styles
The type of numbers of the footnotes can be modified and the possible styles are:

To make an example, the command \renewcommand{\thefootnote}{\roman{footnote}} sets the number style to lower case roman. It can be used in the preamble to change the numbering style of the footnotes in the whole document.

CODE
\documentclass{article}
\begin{document}

\section{Footnotes}

This is a test to check if the footnote \footnote[10]{it works} works. The footnote text\footnotemark can be written in a new line.

\footnotetext{second footnote}

The same footnote\footnotemark can be repeated more than once\footnotemark[\value{footnote}].

\footnotetext{the same footnote}

\renewcommand{\thefootnote}{\roman{footnote}}

Testing footnote in Roman\footnote{footnote in Roman numerals}

\end{document}