How can I change all of my section titles formatting in LaTeX?

Something like this?

documentclass[a4paper, 12pt, fleqn]{article}
usepackage{titlesec}
usepackage{xcolor}
renewcommand{familydefault}{sfdefault}
titleformat{section}[display]{centeringLargebfseries}{}{0pt}{underline}
titleformat{subsection}{largebfseriescolor{darkgray}}{}{0pt}{underline}
titleformat{subsubsection}{bfseriescolor{gray}}{}{0pt}{}
setcounter{secnumdepth}{0}
begin{document}
section{Section Title}
subsection{Subsection Title}
subsubsection{Subsubsection Title}
Text
end{document}