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+% preamble
+\documentclass[12pt]{article}
+%\usepackage[text={5in,5in},centering]{geometry}
+%\usepackage[margin=1.5in]{geometry}
+%\usepackage[total={6.5in,8.75in},top=1.2in,left=0.9in,includefoot]{geometry}
+\usepackage[english]{babel}
+\usepackage[left=2.5cm, right=3cm, top=1.5cm, bottom=2cm]{geometry}
+\usepackage{lipsum}
+\usepackage{multicol}
+
+% basic legnths:
+\setlength{\parskip}{1cm} %
+\setlength{\parindent}{0.3in}
+\renewcommand{\baselinestretch}{1.5}
+\setlength{\columnsep}{2.5cm}
+
+%Body
+\begin{document}
+\section{Setting Lengths}
+\label{sec:first}
+
+\lipsum[1]
+
+\lipsum[2]
+
+\lipsum[3]
+\newpage
+\section{Spaces}\label{sec:spaces}
+
+\begin{multicols}{2}
+  [\subsection{Columns space}
+    This is some text in just one column. However, the next text is in multiple columns.]
+\lipsum[3]
+\end{multicols}
+
+\newpage
+\subsection{Other kind of Spaces}
+\label{sec:others}
+
+Here are some special spaces, \hspace{3cm} like horizontal.\par
+Also vertical space \hfill here. \vspace{1cm}
+
+
+New paragraph.\par
+
+\vfill
+
+At bottom.
+
+\section{Text alignment}
+\label{sec:alingment}
+
+
+
+\end{document}
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