separation between frame and subsections

presentation.tex

@@ -100,9 +100,10 @@ time so that you can recall specific versions later.
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \section{Git from the inside out}
 
+\subsection{Git repository}
+
 \begin{frame}[fragile]
   \frametitle{Creating a git repository}
-
 Creating a project folder
 \vspace{-1em}
 \begin{shcode}
@@ -122,6 +123,7 @@ alpha
 \vspace{-1em}
 \end{frame}
 
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \begin{frame}[fragile]
   \frametitle{Creating a git repository}
 Creating a git repository
@@ -154,6 +156,8 @@ All the other files are collectively known as the \textbf{working copy}.
 They are the user’s.
 \end{frame}
 
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\subsection{Tracking files with Git}
 \begin{frame}[fragile]
   \frametitle{tracking a file with git}
 We want to track the modification made to \mintinline{sh}{letter.txt}
@@ -176,6 +180,7 @@ alpha
 \vspace{-1em}
 \end{frame}
 
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \begin{frame}[fragile]
   \frametitle{git add : part 1}
 We want to track the modification made to \mintinline{sh}{letter.txt}\\[-2.5em]
@@ -201,6 +206,7 @@ Git \textbf{blob}:\\[-2.5em]
 \end{itemize}
 \end{frame}
 
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \begin{frame}[fragile]
   \frametitle{git add : part 2}
 git adds the file to the index\\[-2.5em]
@@ -226,6 +232,7 @@ It is stored in \mintinline{sh}{.git/index}\\[-2.5em]
 \vspace{-2.5em}
 \end{frame}
 
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \begin{frame}[fragile]
   \frametitle{git add : part 3}
 
@@ -258,6 +265,7 @@ And add it to the index\\[-2.5em]
 \vspace{-2.5em}
 \end{frame}
 
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \begin{frame}[fragile]
   \frametitle{git add : part 3}
 
@@ -289,6 +297,10 @@ git creates a new blob for the new \mintinline{sh}{data/number.txt}\\[-2.5em]
 \vspace{-2.5em}
 \end{frame}
 
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\subsection{Committing change to Git}
+
 \begin{frame}
   \frametitle{git commit}
   \begin{center}