\documentclass[11pt, a4paper]{article}

\usepackage[spanish]{babel}
\decimalpoint % decimals with point (always use \, to separate thousands)

%% For other European languages use, for instance:
%\usepackage[french]{babel}
%\usepackage[italian]{babel}
%\usepackage[ngerman]{babel}
%...

%% Highly recommended when not writing in English:
\usepackage[utf8]{inputenc} 
\usepackage[T1]{fontenc}
\usepackage{lmodern} % modern Knuth fonts

% To automatically save paper and trees (at least, for preprints):
%\usepackage{fullpage} % or \usepackage[headings]{fullpage}

% To load external graphics:
\usepackage{graphicx}

% AMS packages, very recommended for maths:
\usepackage{amsmath, amsthm, amsfonts, amssymb}

% To automatically include internal hyperlinks 
% and internet links with \url{http://....} 
\usepackage{hyperref}

\title{Brief Article}
\author{The Author}
%\date{}     % Activate to display a given date or no date

\begin{document}

\maketitle

%\section{}

%\subsection{}

\end{document}
