Untitled

\documentclass[a4paper,12pt]{article}
\begin{document}
\title{ Book recommendation System using ML }
\author{Debapriya Dhar}
\date{\today}
\maketitle
\pagenumbering{roman}
\tableofcontents
\newpage
\pagenumbering{arabic}
\section{Introduction}
\paragraph{paragraph 1}
Recommendation systems recommend product that satisfy user interest.
\subparagraph{sub-paragraph 1}
Book Recommendation system recommend book that satisfy user interest.
\section{Methods}
\subsection{Data Collection }
\label{data_collect}
The first part of the methods is to collect data .
\subsection{Data Analysis }
The second part of the methods is to use a Ml model to train data.
\section{Results}
Here are my results.
Referring to section \ref{data_collect} on page \pageref{data_collect} .
\end{document}