\documentclass[a4paper,12pt]{article}
\begin{document}

% In this we will experiment with various
% sizes and text effects available to us.   

\begin {raggedleft}
\bf\Large {The Size}
\end{raggedleft}
\vspace{5 mm}

\tiny{tiny}

\scriptsize{scriptsize}

\footnotesize{footnotesize}

\small{small}

\normalsize{normalsize}

\large{large}

\Large{Large}

\huge{huge}

\LARGE{LARGE}

\normalsize

\vspace{5 mm}
\begin {raggedleft}
\bf {\Large The Text Effects}
\end{raggedleft}
\vspace{5 mm}

{\bf boldface}

{\em italic}

\underline{underline}

{\sc Small Caps}
\vspace{5 mm}

\raggedright
You have to note two things.  First, if you put slash something
then the effect applies to everthing that follows until 
you formally end it.  If you put it within the bracket then the
effect applies only to items within the brackets.

\end{document}