diff --git a/content/01_git/0_intro.md b/content/01_git/0_intro.md
index 2b4ffc2b8ec726b9ee4f1ac5e7ff4361b56fafdd..b3296f011be8a05e2e17dadc91a17258e15a8368 100644
--- a/content/01_git/0_intro.md
+++ b/content/01_git/0_intro.md
@@ -7,7 +7,7 @@ Git is first of all a version control software. A version control is a system th
 - if you break your code, you can easily revert to an older version.
 - you can upload your code to a (private or public) remote repository (i.e. on the Internet). Losing your laptop is annoying enough. Make sure your code, the result of hard work of hours, if not years, is safe!
 
-```{figure} ../../figures/git_computer_exercise.pdf
+```{figure} ../../figures/git_computer_exercise.png
 ---
 align: center
 ---
diff --git a/content/01_git/2_cmd.md b/content/01_git/2_cmd.md
index 8e1791870c39085a3fa18f170da8bae25ad29038..034e0f9a9dac0b8c30882c04ef7c1d64484eac06 100644
--- a/content/01_git/2_cmd.md
+++ b/content/01_git/2_cmd.md
@@ -8,8 +8,6 @@ As a first step we are navigating to our project folder, initializing the reposi
 ```console
 cd path/to/my/local/repository
 git init
-git add .
-git commit -m "Initial commit"
 ```
 
 ## Push the Local Repository to Remote
@@ -43,8 +41,16 @@ In order to access your repository from different machines, you may want to sync
     ```
     Exchange the ```<placeholder>``` with the corresponding entries. Hint: Edit the above command in a text editor and copy-paste the correct expression into your terminal.
 
+5. Commit your changes
 
-5. Push your changes to the remote repository:
+    ```console
+    git add .
+    git commit -m "Initial commit"
+    ```
+    If it is the first time that you are committing from a computer, git may prompt you to configure your mail and email address. You need to follow these instructions in the terminal before you continue.
+
+
+6. Push your changes to the remote repository:
     ```console
     git push --set-upstream origin main
     ```
diff --git a/content/04_cluster/0_intro.md b/content/04_cluster/0_intro.md
index 1a8f244fb357b051731fbd5e5987b697fb1bf4bf..a97697524bd56643df6b3b306def07f244f3839b 100644
--- a/content/04_cluster/0_intro.md
+++ b/content/04_cluster/0_intro.md
@@ -4,7 +4,7 @@ The **KI4ALL-Cluster** provides a number of high-performance GPUs on which simul
 
 In the following sections, we give an introduction to Slurm. However, it is necessary that you also deal with the referred documentations. 
 
-```{figure} ../../figures/cluster.pdf
+```{figure} ../../figures/cluster.png
 ---
 align: center
 ---
diff --git a/figures/cluster.png b/figures/cluster.png
new file mode 100644
index 0000000000000000000000000000000000000000..8d82b82b3dd388c0fd4a5fb6a6838fd8ca3a13ea
Binary files /dev/null and b/figures/cluster.png differ
diff --git a/figures/git_computer_exercise.png b/figures/git_computer_exercise.png
new file mode 100644
index 0000000000000000000000000000000000000000..f89fbe9155b4cd399abc1e70b5d2811a293bc975
Binary files /dev/null and b/figures/git_computer_exercise.png differ