Prof. van Duck would like to give his suggestion:
\documentclass{beamer}
\usefonttheme{professionalfonts} % using non standard fonts for beamer
\usefonttheme{serif} % default family is serif
\usetheme{Madrid}
\beamertemplatenavigationsymbolsempty
\setbeamersize{text margin left=30pt,text margin right=30pt}
\title[\LaTeX{}: what and why]{What is \LaTeX{} and why should I use it?}
\author[Prof.\ van Duck]{Herr Professor Paulinho van Duck}
\institute[QU]{Quack University}
\usepackage{mathtools}
\usepackage{chemformula}
\usepackage{chemfig}
\usepackage{booktabs}
\usepackage{tikz}
\usepackage[most]{tcolorbox}
\tcbuselibrary{listings}
\lstdefinestyle{mylatex}{
language={[LaTeX]TeX},
basicstyle=\scriptsize\ttfamily,
keywordstyle=\color{blue},
breaklines=true,
breakatwhitespace=true,
}
\newtcblisting{mylisting}{
listing engine=listings,
colback=blue!5!white,
colframe=blue!75!black,
halign upper=center,
halign lower=center,
%listing side text,
%fontlower=\small,
listing options={style=mylatex}
}
\begin{document}
\begin{frame}
\titlepage
\end{frame}
\begin{frame}
\frametitle{What is \LaTeX?}
It is a mix!
\begin{center}
\begin{tikzpicture}
\begin{scope}
\fill[red!30!white, opacity=.5] ( 90:1.2) circle (2);
\fill[green!30!white, opacity=.5] (210:1.2) circle (2);
\fill[blue!30!white, opacity=.5] (330:1.2) circle (2);
\end{scope}
\node at ( 90:2) {Typography};
\node at ( 210:2) {Design};
\node at ( 330:2) {Coding};
\node [font=\Large] {\LaTeX};
\end{tikzpicture}
\end{center}
{\scriptsize\hfill
\href{http://latex-cookbook.net/cookbook/examples/venn/}{Venn diagram by
Stefan Kottwitz}}
\end{frame}
\begin{frame}
\frametitle{Why should I use it?}
\begin{itemize}
\item Gorgeous results, incomparable with other tools
\item Easy referencing of any part of your documents and creation of ToC, ToF,
etc.
\item Great bibliography management
\item Very convenient for scientific or linguistic writing
\end{itemize}
\vfill
\begin{tcolorbox}[
colframe=red,
title={Caution!}]
\LaTeX{} is not for people who want it all and now!
\end{tcolorbox}
\end{frame}
\begin{frame}[fragile]{Document structure}
\begin{lstlisting}[style=mylatex]
\documentclass{article} % <--- document class
\usepackage{graphicx} % <--- preamble
\usepackage{caption}
\begin{document} % <--- body of the document
\section{A section}
Figure \ref{fig:mylabel} % <--- text
is an example image.
\begin{figure} % <--- environment
\centering % <--- macro
\includegraphics{example-image}
\caption{\label{fig:mylabel}A caption}
\end{figure}
\end{document}
\end{lstlisting}
\end{frame}
\begin{frame}[fragile]
\frametitle{Professional tables}
\begin{mylisting}
% \usepackage{booktabs} in preamble
\begin{tabular}{lcr}
\toprule
First Name & Last Name & Gender \\
\midrule
Paulette & de la Quack & F \\
Paulinho & van Duck & M \\
\bottomrule
\end{tabular}
\end{mylisting}
\end{frame}
\begin{frame}[fragile]{Mathematical writing}
\begin{mylisting}
\[ax^2+bx+c=0\]
\[
x_{1,2}=\frac{-b\pm\sqrt{b^2-4ac}}{2a}
\]
\end{mylisting}
\end{frame}
\begin{frame}[fragile]{Chemical formulae}
\begin{mylisting}
%\usepackage{chemformula}
\ch{H2O}
\medskip
%\usepackage{chemfig}
\chemfig{H-[:30]O-[:150]H}
\end{mylisting}
\end{frame}
\begin{frame}[fragile]{Graphical drawing}
\begin{mylisting}
%\usepackage{tikz}
\begin{tikzpicture}[scale=.5]
\draw[->] (-4,0) -- (4,0) node[right] {$x$};
\draw[->] (0,-1.4) -- (0,4) node[above] {$f(x)$};
\draw[domain=-2.5:2,variable=\x,black,thick] plot ({\x},{(\x)^2+.5*(\x)-1})
node[below right] {$x^2+\frac{1}{2}x-1$};
\end{tikzpicture}
\end{mylisting}
\end{frame}
\end{document}
