Issue with the item command

I have the following document (which is a resume) :

documentclass[letterpaper,11pt]{article}
newlength{outerbordwidth}
pagestyle{empty}
raggedbottom
raggedright
usepackage[svgnames]{xcolor}
usepackage{framed}
usepackage{tocloft}
usepackage{graphicx}

% Special chars
usepackage[utf8]{inputenc}
usepackage[T1]{fontenc}

%-----------------------------------------------------------
%Edit these values as you see fit

setlength{outerbordwidth}{3pt}  % Width of border outside of title bars
definecolor{shadecolor}{gray}{0.75}  % Outer background color of title bars (0 = black, 1 = white)
definecolor{shadecolorB}{gray}{0.93}  % Inner background color of title bars


%-----------------------------------------------------------
%Margin setup

setlength{evensidemargin}{-0.25in}
setlength{headheight}{0in}
setlength{headsep}{0in}
setlength{oddsidemargin}{-0.25in}
setlength{paperheight}{11in}
setlength{paperwidth}{8.5in}
setlength{tabcolsep}{0in}
setlength{textheight}{9.5in}
setlength{textwidth}{7in}
setlength{topmargin}{-0.3in}
setlength{topskip}{0in}
setlength{voffset}{0.1in}


%-----------------------------------------------------------
%Custom commands
newcommand{resitem}[1]{item #1 vspace{-2pt}}
newcommand{resheading}[1]{vspace{8pt}
    parbox{textwidth}{setlength{FrameSep}{outerbordwidth}
    begin{shaded}
setlength{fboxsep}{0pt}framebox[textwidth][l]{setlength{fboxsep}{4pt}fcolorbox{shadecolorB}{shadecolorB}{textbf{sffamily{mbox{~}makebox[6.762in][l]{large #1} vphantom{p^{E}}}}}}
    end{shaded}
    }vspace{-5pt}
}
newcommand{ressubheading}[4]{
begin{tabular*}{6.5in}{l@{cftdotfill{cftsecdotsep}extracolsep{fill}}r}
        textbf{#1} & #2 
        text{#3} & textit{#4} 
end{tabular*}vspace{-6pt}}
%-----------------------------------------------------------


begin{document}

begin{tabular*}{7in}{l@{extracolsep{fill}}r}
textbf{Large John Doe} 
[email protected] 
xx xx xx xx xx 
Imaginary city COUNTRY 
N'{e}e le xx/xx/xxxx & hfill
smash{includegraphics[width=2cm,height=3cm,keepaspectratio]{profil.png}} 
end{tabular*}


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
resheading{Compétences}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
begin{itemize}

    item[] ressubheading{Langages}{}{Node/Express, Typescript, PHP, SQL, Javascript, Python, HTML5, CSS3}{}
    vspace{0.1cm}

end{itemize}

end{document}

In fact, the document have two other begin{itemize} sections, and there is more items in the itemize showed here but I don’t think that it would be helpfull for the question.

The issue is, for each line starting by item[] like :

item[] ressubheading{Langages}{}{Node/Express, Typescript, PHP, SQL, Javascript, Python, HTML5, CSS3}{}
    vspace{0.1cm}

I have five times the error :

Missing control sequence inserted.
<inserted text> 

I already searched about this error and found a lot of answers but to be honest I am far from being an experienced LaTex user and none of the answers I saw solved my issue.

I use the command pdflatex doc.tex to create the pdf. This command generates a lot of errors but by pressing enter for each error, the pdf is finally cleanly created.

However, I would like to not have these errors and also learn a bit more about LaTex…

(I am sorry I did not knew which tags to use for this question so I put itemize and enumitem but I would gladly change it for something more appropriate if an experienced tells me the tags I should use with this question)

documentclass{article}

usepackage[utf8]{inputenc}

newcommand{ressubheading}[4]{%
  begin{tabular*}{6.5in}{ l r }
    textbf{#1} & #2 
    textsl{#3} & textit{#4} 
  end{tabular*}}

begin{document}

begin{itemize}
  item
    ressubheading
      {Languages}
      {}
      {Node/Express, Typescript, PHP, SQL, Javascript, Python, HTML5, CSS3}
      {}

  item
    ressubheading
      {Devops & Bonnes pratiques}
      {}
      {Docker, CI/CD via gitlab, TDD}
      {}

  item
    ressubheading
      {Base de données}
      {}
      {MySql, MongoDB}
      {}

  item
    ressubheading
      {Outils}
      {}
      {Git, Redmine, Visual Studio Code, SonarQube}
      {}
end{itemize}

end{document}