\documentclass{article}
\usepackage[ngerman]{babel}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}

\title{Exercise on Project Structure}

\begin{document}
\maketitle
\tableofcontents

\newpage
\input{section1}
\newpage
\input{section2}
\newpage
\input{section3}

\end{document}