Here is my code
\documentclass{article}
\usepackage{multicol}
\title{IELTS Course Companion}
\author{Ethen Hu}
\begin{document}
\setlength{\parindent}{0pt}
\maketitle
\section{numbers}
\subsection{question\footnote{OG 3.1}}
\begin{multicols}{2}
\renewcommand{\labelenumi}{\alph{enumi}}
\begin{enumerate}
\item 1st/3rd
\item \$10.50/\$10.15
\item 6th/5th
\item 17/70
\item 19/90
\columnbreak
\item 15/50
\item 52/62
\item \pounds110/\pounds810
\item 31st/33rd
\item 22nd/27th
\end{enumerate}
\end{multicols}
%\subsection{question 2 \footnote{OG 3.3}
\end{document}
This is successfully compiled on overleaf, but with a warning:argument of@sect has an extra}. runaway argument?
This is the error page incase it is of anyhelp. I guess it has something to do with trying to put a footnote on