\documentclass[aspectratio=169,10pt]{beamer}
%This is the usual LaTeX header with the most important settings. The options in \documentclass are particularly important:

%aspectratio=169 ensures that the slide has the 16:9 format of modern screens and projectors (and not 4:3 like 20 years ago, which would result in large black bars on the sides).

%10pt is the font size.

%And beamer ensures that a presentation is generated in the first place.

%Here, various packages are loaded - if everything works, you can leave them as they are.
\usepackage{graphicx}
\usepackage{bm}
\usepackage{hyperref}
\usepackage{ulem}
\usepackage[ngerman]{babel}
\usepackage[utf8]{inputenc}
\usepackage{marvosym}

%This is the style of the presentation template (colors, etc.)
\usetheme{Boadilla}
\setbeamercolor{colorbox}{fg=yellow,bg=red}

\begin{document}

%This generates the footer (page numbers, etc.). For now, it's fine to leave it as it is.
\beamertemplatenavigationsymbolsempty
\setbeamertemplate{footline}
{%
\begin{beamercolorbox}[wd=0.5\textwidth,ht=3ex,dp=1.5ex,leftskip=.5em,rightskip=.5em]{fg=yellow,bg=red}%
\usebeamerfont{author in head/foot}%
\hfill\insertshortauthor%
\setbeamercolor{footline}{fg=yellow,bg=red}
\end{beamercolorbox}%
\vspace*{-4.5ex}\hspace*{0.5\textwidth}%
\begin{beamercolorbox}[wd=0.5\textwidth,ht=3ex,dp=1.5ex,left,leftskip=.5em]{fg=yellow,bg=red}%
\usebeamerfont{title in head/foot}%
\insertshorttitle\hfill\hspace{1cm}\insertframenumber/\inserttotalframenumber%
\end{beamercolorbox}%
}

%These are the details for the title page (1st slide)
\title{This is the title of the presentation}
\author{Christian Manger}
\date{November 2024}

%This actually generates the title page (1st slide)
\frame{\titlepage}

%Now the first "real" slide begins. Each slide starts with \frame{\frametitle{Heading} and, very importantly, ends with } to close the bracket.
\frame{\frametitle{A Very Simple Slide}
Text
}

\frame{\frametitle{Another Slide}
In general, these slides work just like other LaTeX files. For example, lists are possible:
\begin{itemize}
\item Important information
\item Also very important information
\item Probably even more important
\end{itemize}
}

\frame{\frametitle{Yet Another Slide}
{\Large It can also make sense to enlarge the font.}\\[0.2cm]

{\begin{LARGE} 
Or even larger. \textbf{Formulas} are, of course, also important:
\begin{align}
f(x,y)&=5x^2+17+29^3y+6\cdot 4\\ %with \cdot we create a multiplication dot
g(x)&=y^3+\sqrt{x}
\end{align}
\end{LARGE}}
}

\end{document}
