\documentclass{beamer}
\usetheme{Pittsburgh}
\usepackage[ngerman]{babel}


\begin{document}
\title{\LaTeX-Workshop}   
\author{valy,...} 
\date{\today} 

\frame{\titlepage} 

\frame{\frametitle{Agenda}\tableofcontents} 


\section{Einf"uhrung} 
\frame{\frametitle{Einf"uhrung}
Each frame should have a title.
}

\section{Referenzen} 
\frame{\frametitle{Referenzen} 
Each frame should have a title.
}
\section{Pakete} 
\frame{\frametitle{Pakete} 
Each frame should have a title.
}
\section{Formeln}
\frame{\frametitle{Formeln} 
Each frame should have a title.
}
\section{Grafiken}
\frame{\frametitle{Grafiken}

\begin{block}{title of the bloc}
bloc text
\end{block}


\begin{alertblock}{title of the bloc}
bloc text
\end{alertblock}
}
\section{Grafische Oberfl"achen}
\frame{
\frametitle{Grafische Oberfl"achen}

\begin{exampleblock}{title of the bloc}
bloc text
\end{exampleblock}
}
\subsubsection{Lyx}
% subsubsection  (end)

\subsubsection{Tex-Studio}
% subsubsection  (end)

\subsubsection{Gummi}
% subsubsection  (end)

\end{document}