diff --git a/ch01/lesson-12.org b/ch01/lesson-12.org
index 79e6ae8..460eb7c 100644
--- a/ch01/lesson-12.org
+++ b/ch01/lesson-12.org
@@ -208,9 +208,13 @@ func _physics_process(delta):
 - duplicate the current animation
 - modify and set whatever properties are necessary for each animation
 
-** modify script
+*** modify script
 - set the animations variable from $AnimatedSprite2D to $AnimationPlayer
 
+** adding hurt to hit box collision
+*** hit box
+- Player->hurtBox->Node Tab (not Inspector!)->Area2D->area_entered(area: Area2D)
+
 * Video Contents
 
 [[https://www.youtube.com/watch?v=WVQkOWY3zxQ][Lesson Link]]
diff --git a/cho1/lesson-13.org b/cho1/lesson-13.org
new file mode 100644
index 0000000..b5cbbdb
--- /dev/null
+++ b/cho1/lesson-13.org
@@ -0,0 +1,40 @@
+#+HTML_HEAD: <link rel="stylesheet" type="text/css" href="../../../../_share/media/css/org-mode.css" />
+#+HTML_HEAD: <link rel="stylesheet" type="text/css" href="../../_share/media/css/godot.css" />
+#+title: Lesson 13:  Player Health | part 1
+
+
+* Links
+- [[../../arpg/toc.org][< Back to Main TOC]]
+- [[https://www.youtube.com/watch?v=7rmtxjAjUPc][Player Health | part 1]]
+
+
+* Notes
+
+** intro
+- first of two episodes
+- add health to player
+- create gui
+
+** player health
+- in player script add variable for health
+
+#+begin_src godot
+var currentHealth: int = 3
+#+end_src
+
+- decrease health every time player enters a hit box
+
+* Video Contents / Playlist
+
+#+attr_html: :class content
+- [[https://www.youtube.com/watch?v=7rmtxjAjUPc][00:00 intro]]
+- [[https://youtu.be/7rmtxjAjUPc?si=TM8aN4tKDDMNQ4R2&t=15][00:15 player health]]
+- [[https://youtu.be/7rmtxjAjUPc?si=lijARa4yr18XT_lm&t=79][01:19 max health]]
+- [[https://youtu.be/7rmtxjAjUPc?si=T5ytn-bXJSRg7oU_&t=147][02:27 heart container]]
+- [[https://youtu.be/7rmtxjAjUPc?si=A3ug1hGXKHi2j9gI&t=183][03:03 heart gui]]
+- [[https://youtu.be/7rmtxjAjUPc?si=lCdHAHKPiICvmQbV&t=219][03:39 self modulate]]
+- [[https://youtu.be/7rmtxjAjUPc?si=7PzW3aZPQTWJGVh7&t=258][04:18 layout min size]]
+- [[https://youtu.be/7rmtxjAjUPc?si=kKyF0tRjTYbO2HAu&t=309][05:09 HBoxContainer]]
+- [[https://youtu.be/7rmtxjAjUPc?si=Gs5odvAhZLYi6YX8&t=390][06:30 Add gui to world]]
+- [[https://youtu.be/7rmtxjAjUPc?si=2ibqcYJtKh8ZfERE&t=428][07:08 Anchors preset]]
+- [[https://youtu.be/7rmtxjAjUPc?si=TtgvyFGvz4s1yljN&t=451][07:31 outro]]
diff --git a/toc.org b/toc.org
index 5487f5d..a4497fa 100644
--- a/toc.org
+++ b/toc.org
@@ -13,6 +13,7 @@
 *** [[file:./ch01/g10-tilemap terrains-part2.org][Lesson 10: Tilemap Terrains (autotiles), part 2]]
 *** [[file:ch01/lesson-11.org][Lesson 11: Creating the First Enemy]]
 *** [[file:ch01/lesson-12.org][Lesson 12: Player-Enemy Collision]]
+*** [[file:cho1/lesson-13.org][Lesson 13: Player health | part 1]]
 
 * Playlists