%Preamble
\documentclass[a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage{lipsum}
\title{My First Document in \LaTeX{}}
\author{Gerardo Marx Chávez Campos}
\date{2021/01/28}
%document's body:
\begin{document}
\maketitle{}
\lipsum[1-2]
\end{document}