\documentclass{beamer}
\usetheme{Warsaw}
\usepackage{graphicx}
\begin{document}
\title{Beamer Tutorial}
\institute{University of Ioannina}
\date{\today}
\begin{frame}
\maketitle
\end{frame}

\begin{frame}
\frametitle{Outline}
\tableofcontents[part=1, pausesections]
Test text here
\begin{enumerate}
\item Introduction
\end{enumerate}
\end{frame}

\begin{frame}[t]
\frametitle{Algorithmic Combinatorics on Words}
\textit{Words}, or strings of symbols over..
\end{frame}

\begin{frame}
\frametitle{Introduction}
\section {Introduction}
\textbf{This is a text}
\end{frame}

\begin{frame}
\begin{itemize}
\item Introduction to \LaTeX \pause
\item Course 2 \pause
\item Presentations with \LaTeX \pause
\item Beamer class
\end{itemize}
\end{frame}


\begin{frame}
\frametitle{Example columns}
\begin{columns}
\column{.5\textwidth} 
Column Number 1
\column{.5\textwidth}
Column Number 2
\end{columns}
\end{frame}

\begin{frame}
\frametitle{Example columns}
\begin{itemize}
\item< 1 > Firstitem
\begin{itemize}
\item First subitem
\item Second subitem
\end{itemize} \item< 2>
Second item
\item< 3 > Thirditem
\end{itemize}
\end{frame}

\end{document}
