LaTeX.org

Perfect. That got me in the right direction. Saved me a lot of time.

I did change the arabic in: \renewcommand*{\thesubsection}{\arabic{subsection}.}

to alph: \renewcommand*{\thesubsection}{\alph{subsection}.}

to get letters instead of numbers.

How do I change the default section numbering to the format below? I am using Miktex console 2.9 and Texmaker.

I. Section
a. Subsection
b. Subsection
i. Subsubsection
ii. subsubsection

I have tried searching and don't find exactly what I need. I am so new at Latex that I probably don't know ...