This is a list of frequently use packages:
(Usage: Insert \usepackage{package} before \begin{document})
anysize: Set margins
\marginsize{l}{r}{t}{b}multicol: Use n columns
\begin{multicols}{n}graphicx: For displaying images
\includegraphics[width=3cm]{filename}
\includegraphics[width=0.50\textwidth]{filename}url: To insert URL
\url{http://selinap.com}
