\documentclass{article}
\title{A simple example}
\author{Fokrul Islam}
\begin{document}
  \maketitle
	you should not read this paper anyway..
\tableofcontents
\section{Something Important}
\subsection{sub}
{\LARGE Hello world}
\section{filter}
The quick brown fox jumps over the lazy dog.\\
The quick brown fox jumps over the lazy dog.
\end{document}