how to reduce space between 2 sections in latex code example

Example 1: latex reduce letter spacing

\usepackage[tracking=true]{microtype}

\textls[100]{normal} % 100 is the default value
\textls[200]{more space}
\textls[50]{less space}

Example 2: latex reduce space between items

\usepackage{enumitem}
\begin{itemize}[noitemsep]
    \item 
    \item 
\end{itemize}