Section titles should be bold+small-caps (but this code fail to do it)
\usepackage{titlesec}
\titleformat{\section}{\Large\sc\bfseries}{}{}{}[]
Full code:
\documentclass[a4paper,12pt]{article}
\usepackage{titlesec}
\titleformat{\section}{\Large\sc\bfseries}{}{}{}[]
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\setcounter{secnumdepth}{0}
\begin{document}
\section{1 Introduction}
\end{document}
Please only make it work for section titles (not for subsection\subsubsection etc..)

\scwhich do not combine, your usage\sc\bfseriesworks but looks odd (and wouldn't work if\bfserieswas first)\scshapeis the standard command. – David Carlisle Sep 13 '21 at 17:59