Untitled

\documentclass[a4paper,12pt]{article}
\begin{document}
\title{My First Document}
\author{Aisha Hayder Chowdhury}
\date{\today}
\maketitle
\pagenumbering{roman}
\tableofcontents
\newpage
\pagenumbering{arabic}
\section{Introduction}
This is the introduction
\section{Methods}
\paragraph{Life}
We are going to disucss life here.
\subparagraph{What is life}
Life is a gift.


\subsection{Stage 1}
\label{sec1}
The first part of the methods.
\subsection{Stage 2}
The second part of the methods.
\section{Results}
Here are my results. Referring to section \ref{sec1} on page \pageref{sec1}.

\end{document}