Removing whitespace before the itemize symbol

Question

I wonder how to remove whitespace before itemize symbol.

\documentclass{article}
\usepackage{enumitem}
\setlength{\parindent}{0pt}

\begin{document}
    \begin{itemize}[noitemsep, topsep=0pt]
    \item First Item
    \item Second Item
    \end{itemize}
\end{document}

Answer 1

The wide option is here for that. Your options [noitemsep,topsep=0pt] is equivalent to the shortest [nosep]. Here are three variants: you can have the left margin of the list coincide with the text left margin (default) or with the beginning of the text of the item:

\documentclass{article}
\usepackage{enumitem}
\setlength{\parindent}{0pt}

\begin{document}

\begin{itemize}[nosep, wide]
  \item First Item
  \item Second Item
\end{itemize}
\bigskip

\begin{itemize}[nosep, wide=0pt]
  \item First Item
  \item Second Item
\end{itemize}
\bigskip

\begin{itemize}[nosep, wide, leftmargin=*]
  \item First Item
  \item Second Item
\end{itemize}

\end{document}

The bullet is by default indented by \parindent, but you may change it setting wide=some length.

Answer 2

In the options of the itemize environment you could use labelindent=0cm and leftmargin=0cm to get rid of \setlength{\parindent}{0pt}; and if you want the bullet to be aligned with the text, add wide to the options.

\documentclass{article}
\usepackage{enumitem}
\usepackage{lipsum}

\begin{document}
\lipsum[1]
\begin{itemize}[nosep,wide,labelindent=0cm,leftmargin=0cm]
  \item First Item
  \item Second Item
\end{itemize}
\lipsum[2]
\end{document}