How do you split a Beamer slide into two columns?

The following minimal working example shows how to do so:

% Beamer columns
\documentclass{beamer}

% Theme choice
\usetheme{Berlin}

\begin{document}

\begin{frame}{Two columns example}

% start the columns environment    
\begin{columns} 

% Column 1
    \begin{column}{.5\textwidth}
        Left Part contents
    \end{column}

% Column 2    
    \begin{column}{.5\textwidth}
        Right Part contents
    \end{column}%
    
\end{columns}

\end{frame}

\end{document}

and the result is shown below:

split a frame to two columns in beamer — How a slide with two columns looks in beamer

For more columns, you can create more column environment inside columns environment with the width that you like.