\documentclass[a4paper]{scrartcl}

\usepackage{lipsum}

\begin{document}

\part{Experiments with TOC}
 
\tableofcontents



\section{One}


\subsection{Section 1.1}
 
\lipsum[3]

\subsection{Section 1.2}
\lipsum[4]

\section{Two}

\subsection{Section 2.1}
\lipsum[3]

\subsection{Section 2.2}
\lipsum[4]


\end{document}

