% TODO: Make this document a report on A4 paper.
\documentclass[a4paper]{report}

% TODO: Specify UTF-8 as the input encoding to add umlaut support.
\usepackage[utf8]{inputenc}

% TODO: Specify T1 as the font encoding. 
\usepackage[T1]{fontenc}

% TODO: Add support for the english language.
\usepackage[english]{babel}

% TODO: Add the document environment.
\begin{document}

Hello, world!

% TODO: Close the document environment.
\end{document}