\documentclass[12pt]{article}
\author{ntoumos vasileios}
\title{My first title}
\begin{document}
\maketitle
\section {My first section}
\par My first paragraph
\subsection{Myfirstsubsection}
\begin{center} 
`LaTeX is a document preparation system and document markup language. LaTeX uses the TeXtypesetting program for formatting its output \\
latex is not same
\end{center}
\end{document}
