\documentclass[a4paper]{article}

% layout & toc
\usepackage[labelformat=empty]{caption}
% remove section numbers and keep-up with toc
\renewcommand{\thesection}{}
\usepackage[cm]{fullpage}
\usepackage{url}

\begin{document}

\title{some title}
\author{some author}
\maketitle

\tableofcontents

\section{Introduction}

some text

\section{Conclusion}

some text

\end{document}