Very simple 2 columned latex summary

simple-latex-summary.tex

\documentclass[a4paper]{article}
\usepackage[margin=1.2cm]{geometry}
\usepackage{mathtools}
\usepackage{dsfont}

\usepackage{multicol}
\setlength{\columnsep}{1cm}

\usepackage[utf8]{inputenc}
\usepackage{enumitem}

\title{Digital Systems summary}
\author{Jurriaan Den Toonder}
\date{\today}

\begin{document}

\setlength{\abovedisplayskip}{0pt}
\setlength{\belowdisplayskip}{0pt}
\setlength{\abovedisplayshortskip}{0pt}
\setlength{\belowdisplayshortskip}{0pt}

% \maketitle

\begin{multicols*}{2}
    \begin{itemize}[leftmargin=0pt]
        \item Some item
    \end{itemize}
\end{multicols*}

\end{document}