Beamer

\documentclass{beamer}
\usetheme{Berkeley}
\author{Amar Tabakovic}
\title{A Topic}
\subtitle{A subtitle.}
\institute{Institution XYZ}
\date{2023}

%\renewcommand{\footnotesize}{\fontsize{5pt}{7pt}\selectfont}
\graphicspath{{./images/}}

\AtBeginSection[]
{
  \begin{frame}
  \frametitle{Table of Contents}
  \tableofcontents[currentsection]
  \end{frame}
}

\begin{document}

\frame{\titlepage}

\begin{frame}
\frametitle{Table of Contents}
\tableofcontents
\end{frame}

\section{Introduction}

\begin{frame}
\frametitle{Introduction}
\framesubtitle{Slide 1}
Some text.
\end{frame}

\begin{frame}
\frametitle{Introduction}
\framesubtitle{Slide 2}
Some text.
\end{frame}

\end{document}