diff --git a/lp-in-org.org b/lp-in-org.org
index af465ba..53ae79c 100644
--- a/lp-in-org.org
+++ b/lp-in-org.org
@@ -201,3 +201,50 @@ Can we do both Bash, Fish and Powershell?
 ** Graphviz
 ** PlantUML
 ** Pikchr
+* Tips and Tricks
+This final chapter contains optional information you might find useful.
+
+Oh, and please let me know if you have a tip or trick that you think should be included.
+** Yasnippet Templates
+
+If you use [[https://www.emacswiki.org/emacs/Yasnippet][Yasnippet]], and include the [[https://github.com/AndreaCrotti/yasnippet-snippets][yasnippet-snippets project]], you can type =<s= in an Org buffer to expand into a src block, and type =def= in an Emacs Lisp buffer to get a function definition, but why not have both?
+
+In an Org file, type ~M-x yas-new-snippet~ and replace the default text with:
+
+#+begin_example
+  # key: #slf
+  # name: emacs-lisp-defun
+  # --
+  ,#+BEGIN_SRC emacs-lisp
+  (defun ${1:fun} (${2:args})
+    "${3:docstring}"
+    ${4:(interactive${5: "${6:P}"})}
+    $0)
+  ,#+END_SRC
+#+end_example
+
+Type ~C-c C-c~ to save and install the snippet with Org.
+
+Let’s make one for variables:
+
+#+begin_example
+  # key: slv
+  # name: emacs-lisp-defvar
+  # --
+  ,#+BEGIN_SRC emacs-lisp
+  (defvar ${1:symbol} ${2:initvalue} "${3:docstring}")
+  ,#+END_SRC
+#+end_example
+
+And maybe another one for defining unit tests?
+
+#+begin_example
+  # -*- mode: snippet -*-
+  # name: ert-deftest
+  # key: edt
+  # --
+  ,#+BEGIN_SRC emacs-lisp :tangle no
+  (ert-deftest $1-test ()
+    (should (= $0)))
+  ,#+END_SRC
+#+end_example