\documentclass[onecolumn,letterpaper,11pt]{article}
  % Insert any packages, environments, counters, etc. here
  \begin{document}
  % Insert your document contents here
  Hello world! 

\vspace{2cm}  This word is \textbf{bold}.  

\vspace{2cm}   \underline{This phrase is underlined.}  

\vspace{2cm}   Emphasize \emph{some words} when necessary.
  
\vspace{2cm} Bonus: \texttt{This line is in typewriter.}

  \end{document}



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