Added «Notes to self» in preamble

Notes on Python.tex

@@ -19,7 +19,7 @@
 \pagestyle{fancy}
  \fancyhf{} % Clear existing header/footer entries
  \fancyhead[LE, RO]{\thepage} % Page number is always on the outside
- \fancyhead[CE, CO]{Notes on Python}
+ \fancyhead[CE, CO]{Notes on Python} % Title is always in the middle
  \fancyhfoffset[LE,RO]{0in} % Adjust header and footer width to match text width
 % \cfoot{Page \thepage}
 % \renewcommand{\footrulewidth}{0.5pt}
@@ -89,6 +89,11 @@
 \author{Kenneth John Odle\\ \texttt{ken at kjodle dot net}}
 \date{2023\\ \medskip v. 0.0.1}
 
+% Notes to self %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% Make sure that \section{} is OUTside the multicols environment
+% Make sure that \subsection{} is INside the multilcols environment
+% If needed, add \newpage before a \section if the placement of the heading is weird
+
 \begin{document}
 
 \maketitle
@@ -102,6 +107,11 @@
 \section{Preliminaries}
 
 \begin{multicols}{2}
+
+\subsection{What is Python?}
+
+\subsection{Why use Python?}
+
 \lipsum[1]
 
 \lipsum[1]
@@ -145,6 +155,8 @@ It is a long established fact that a reader will be distracted by the readable c
 
 \lipsum[1]
 
+\subsection{This is a subsection}
+
 \lipsum[1]
 
 \begin{wrapfigure}[]{r}[8pt]{0pt}