diff --git a/main.latex b/main.latex
index 82bd6f2..f9ff9a2 100644
--- a/main.latex
+++ b/main.latex
@@ -186,6 +186,9 @@
 
 		These concepts are pretty familiar. A tree can contain other trees or blobs.
 
+		At its core, Git is a content addressed storage tool. All files and folders are addressed by
+		a (hardened) sha1 hash.
+
 	}
 \end{frame}
 
@@ -590,8 +593,35 @@
 		\end{itemize}
 	\note{%
 		We've seen a couple of these (sort of)
+	}
+\end{frame}
+
+\begin{frame}
+	\frametitle{References}
+	\begin{itemize}
+		\item Branches
+			\begin{itemize}
+				\item Parallel development
+			\end{itemize}
+		\item Tags
+			\begin{itemize}
+				\item Special points in history (Release versions)
+			\end{itemize}
+		\item HEAD
+			\begin{itemize}
+				\item Current position in history
+			\end{itemize}
+	\end{itemize}
+	\note{%
+		Branches allow for parallel development, individually or multiple people. We well look at
+		these in more detail in a minute.
 
-		Master and Head
+		Tags allow you to mark special commits. Normally this is used for release versions or
+		similar.
+
+		HEAD refers to the commit or branch you are currently looking at. We will see in a minute
+		that you can revert a whole project to a previous point in time. This is how git knows
+		where (when?) you are.
 	}
 \end{frame}
 
@@ -1057,7 +1087,37 @@
 	Prompt customisation is available out of the box for bash and zsh.
 	\note{%
 		If you haven't ever tried zsh, give it a shot. Tab completion is so much more useful than
-		Bash's.
+		Bach's.
+	}
+\end{frame}
+
+\begin{frame}
+	\frametitle{Useful supporting tools}
+	\framesubtitle{Editor Plugin}
+	\begin{itemize}
+		\item Git Gutters
+		\item Easy staging of parts of a file
+		\item Merge Conflict Resolution
+	\end{itemize}
+	\note{%
+		There are obviously hundreds of editors so find one that works well with yours.
+
+		I think Atom and VS Code have built in integration. 
+
+		I use vim-fugitive. I've heard good things about magit for emacs.
+	}
+\end{frame}
+
+\begin{frame}
+	\frametitle{Useful supporting tools}
+	\framesubtitle{BFG Repo Cleaner}
+	You'll need something like this when you realise you have just committed your ssh keys
+
+	\href{https://rtyley.github.io/bfg-repo-cleaner/}{https://rtyley.github.io/bfg-repo-cleaner/}
+	\note{%
+		For the time that you accidentally commit your ssh keys.
+
+		I accidentally committed a database for an Woocommerce site.
 	}
 \end{frame}
 
@@ -1098,19 +1158,6 @@
 	}
 \end{frame}
 
-\begin{frame}
-	\frametitle{Useful supporting tools}
-	\framesubtitle{BFG Repo Cleaner}
-	You'll need something like this when you realise you have just committed your ssh keys
-
-	\href{https://rtyley.github.io/bfg-repo-cleaner/}{https://rtyley.github.io/bfg-repo-cleaner/}
-	\note{%
-		For the time that you accidentally commit your ssh keys.
-
-		I accidentally committed a database for an Woocommerce site.
-	}
-\end{frame}
-
 \begin{frame}
 	\frametitle{Useful supporting tools}
 	\framesubtitle{Pass}