%! TEX program = xelatex
\documentclass{scrreprt}

\KOMAoptions{
 %twocolumn=on,
 %DIV=24,
 parskip=half,
 twoside=on,
}

% hyphenation
\usepackage[ngerman]{babel}

% hyperlinks and pdf toc
\usepackage[unicode, hidelinks]{hyperref}
\usepackage{bookmark}

% cretion of nice dates from numbers
\usepackage[useregional]{datetime2}

% dummy text
\usepackage{lipsum}

% roman font for title
\addtokomafont{disposition}{\rmfamily}

% heading
\usepackage[automark, headsepline]{scrlayer-scrpage}
\pagestyle{scrheadings}

% bibliography
\usepackage{csquotes}
\usepackage[
 style=iso-authoryear,
]{biblatex}
\addbibresource{bibliography.bib}

\subject{Seminararbeit}
\title{Titel der Arbeit}
\subtitle{Untertitel}
\author{Simon Bruder}
\date{\DTMdisplaydate{2021}{01}{01}{-1}}

\begin{document}
\maketitle

% pre
\pagenumbering{Roman}
\phantomsection{}
\addcontentsline{toc}{chapter}{Inhaltsverzeichnis}
\tableofcontents{}

% main
\clearpage{}
\pagenumbering{arabic}

\chapter{Einleitung}

\section{lol}
\lipsum

\section{foo}
\lipsum\cite{latexcompanion}

% bibliography
\clearpage
\phantomsection
\addcontentsline{toc}{chapter}{Literatur}
\printbibliography

\end{document}