Q:

how to remove punctuation mark in resumeitem but keep the first word bold? 

I have the following lines to generate resume items in my resume.  
 \resumeItemListStart
      \resumeItem {Calculated} {retention and attrition rates among students participating in Row New York’s athletic and academic programs in Manhattan, Brooklyn, and Queens.} 
      \resumeItem {Reviewed} {and cleaned existing records in the organizations SalesForce database using a data de-duplication software}
      \resumeItem{Created}{easy to understand reports and visualizations for monthly operations meetings using the R statistical software}
      \resumeItem {Compiled}{a comprehensive data handbook with information on how to access the organization's data, and the underlying formula’s for calculating various metrics}
            \resumeItemListEnd

This gives the following output 

My question is
1.  how do I remove the colon ":" punctuation mark after the  first word but still keep the first word bold? 

A:

Why don't you simply use the itemize environment?  It works very well - just add the following line to the preamble:
\def\labelitemi{$\circ$}

then, you just have to write like the following
\begin{itemize}
    \item \textbf{ABC} blah blah
    \item \textbf{DEF} blah blah
\end{itemize}

Hope this will help you.