How to put a repeated word "Step" before this enumerate This answer?
Step 1. text
Step 1.1 text
Step 1.2 text
Step 2 text
\documentclass{article}
\usepackage{enumitem}% http://ctan.org/pkg/enumitem
\begin{document}
\begin{enumerate}
\item First
\begin{enumerate}[label*=\arabic*.]
\item Second
\item Third
\end{enumerate}
\item Fourth
\end{enumerate}
\end{document}

[label*=Step \arabic], or define a new enumerate-like list, sayenumstepsand define its layout in the preamble, to avoid repeating the optional arguments in the document body each time you want to use it. – Bernard Jul 24 '21 at 14:45