First Lab exercise questions. Sorry for very small commits. I paid the penalty of losing my entire file on which I had worked on 1 and half days.
\documentclass{article}
\begin{document}
This is my simple document with nested lists.
\begin{enumerate}
\item First Enumerated Item.
\item Second Enumerated Item.
\item Third Enumerated Item.
\begin{itemize}
\item First Item.
\item Second Item.
\item Third Item.
\begin{itemize}
\item First Sub-Item.
\item Second Sub-Item.
\item Third Sub-Item.
\item Fourth Sub-Item.
\end{itemize}
\end{enumerate}
\end{document}