\documentclass{article}
\usepackage[utf8]{inputenc}
\title{Postmortem Title}
\author{Yann-Gael, Cristiano, Tuan, Fatima}
\date{\today}
\begin{document}
\maketitle
\section{Introduction}
2 to 3 paragraphs
\section{What Went Wrong}
\subsection{?}
\subsection{?}
\subsection{?}
\subsection{?}
\subsection{?}
\section{What Went Right}
\subsection{?}
\subsection{?}
\subsection{?}
\subsection{?}
\subsection{?}
\section{Conclusion}
1 paragraph
\end{document}