sample.tex

\documentclass[11pt]{article}

\newcommand{\AUTHOR}{Satej Soman}
\newcommand{\TITLE}{Sample Document}
\newcommand{\CLASSNAME}{TeX Template}

\input{commons.tex}

\begin{document}
{\centering \textit{this document was compiled using LuaLaTeX.}

}
\section{this is what a section title looks like}
\subsection{and this is a subsection!}
\subsubsection{yes, we can go deeper}
This is what some plain text looks like.

\section{how about some math typesetting?}

\begin{align*}
\nabla \times \vec{E} = - \frac{\Partial{\vec{B}}}{\Partial{t}} &&
\op{det} \left( \begin{bmatrix} a & b \\ c & d \end{bmatrix} \right) = ad - bc &&
\Gamma(z) = \int_0^{\infty} t^{\,z-1} \cdot \op{exp}\left(-t\right) \,\D{t} 
\end{align*}

\section{here's some typeset code}

\begin{lstlisting}[language=Python]
def fibonacci(x):
    if x < 2: 
        return x 
    return fibonacci(x - 2) + fibonacci(x - 1)
    
if __name__ == "__main__":
    print(fibonacci(25))
\end{lstlisting}

\end{document}