diff --git a/extra/changed_failed_when.yml b/extra/changed_failed_when.yml
new file mode 100644
index 0000000..63b2e14
--- /dev/null
+++ b/extra/changed_failed_when.yml
@@ -0,0 +1,18 @@
+---
+- hosts:
+    - tn00-debian12
+    - tn00-alpine3i
+
+  gather_facts: no
+
+  tasks:
+    - name: "Gebe CHANGED zurück, wenn /etc/hostname den String 'debian' enthält"
+      command: cat /etc/hostname
+      register: output
+      changed_when: '"debian" in output.stdout'
+
+    - name: "Gebe FAILED zurück, wenn /etc/hostname den String 'alpine' enthält"
+      command: cat /etc/hostname
+      register: output
+      failed_when: '"alpine" in output.stdout'
+
diff --git a/extra/changed_when.yml b/extra/changed_when.yml
new file mode 100644
index 0000000..5c396fb
--- /dev/null
+++ b/extra/changed_when.yml
@@ -0,0 +1,9 @@
+---
+- hosts: all
+  gather_facts: no
+
+  tasks:
+    - command: cat /etc/hosts
+      register: output
+      changed_when: '"ubu" in output.stdout'
+
diff --git a/extra/ein_rechner_failed.yml b/extra/ein_rechner_failed.yml
new file mode 100644
index 0000000..9e74dcd
--- /dev/null
+++ b/extra/ein_rechner_failed.yml
@@ -0,0 +1,26 @@
+---
+- hosts:
+  - tn00-debian12
+  - tn00-alpine3i
+
+  gather_facts: no
+
+  tasks:
+    - name: Debian bricht ab
+      debug:
+        msg: "Hallo"
+      failed_when: '"debian" in inventory_hostname'
+
+
+- hosts:
+  - tn00-debian12
+  - tn00-alpine3i
+
+  gather_facts: no
+
+  tasks:
+    - name: "Wer lebt noch?"
+      debug:
+        msg: "Lebenszeichen"
+
+
diff --git a/extra/wireguard-key-anlegen_changed_when.yml b/extra/wireguard-key-anlegen_changed_when.yml
new file mode 100644
index 0000000..11592d0
--- /dev/null
+++ b/extra/wireguard-key-anlegen_changed_when.yml
@@ -0,0 +1,8 @@
+---
+- hosts: localhost
+  gather_facts: no
+  tasks:
+    - shell: "[ ! -f wg.pub ] && wg genkey | tee wg.priv | wg pubkey | tee wg.pub || true"
+      register: output
+      changed_when: output.stdout != ""
+
diff --git a/extra/wireguard-key-anlegen_creates.yml b/extra/wireguard-key-anlegen_creates.yml
new file mode 100644
index 0000000..09b30cc
--- /dev/null
+++ b/extra/wireguard-key-anlegen_creates.yml
@@ -0,0 +1,8 @@
+---
+- hosts: localhost
+  gather_facts: no
+  tasks:
+    - shell: "wg genkey | tee wg.priv | wg pubkey | tee wg.pub"
+      args:
+        creates: wg.pub
+