How to place content at the top (bottom) of a frame?

By default, beamer writes the content at the center of every frame. But maybe you want this content to be aligned in a different way. For this purpose, the frame environment accepts an optional argument t, c, or b that determines whether the content will be placed at the top, center, or bottom of the frame, respectively.

The following code highlights different content positioning of a frame:

% Content positioning 
\documentclass{beamer}

% Theme choice
\usetheme{Berlin}

\begin{document}

\begin{frame}[t]
    This content will be placed at the top of the frame.
\end{frame}

\begin{frame}[c]
    This content will be placed at the center of the frame.
\end{frame}

\begin{frame}[b]
    This content will be placed at the bottom of the frame.
\end{frame}

\end{document}

Compiling this code yields:

Top positioning of a content beamer latex

Center positioning of a content beamer latex

Bottom positioning of a content beamer latex

To override the default beamer behaviour, you can pass this specification as a package option. For example, the lines \usepackage[b]{beamer} in your preamble will place the contents at the bottom of every frame by default. The same for top positioning (\usepackage[t]{beamer}).