improve the second exercise

content/commits.md

@@ -1,10 +1,27 @@
 # Committing changes
 
-```{exercise} Practice creating commmits and branches (20 min)
-- create a branch and commit to it
-- maybe also commit to main
-- browse network
-- compare branches
-- compare commits
-- rename a branch
+```{instructor-note}
+Before starting the exercise session:
+- Show how to verify whether we are on our fork and not on the original repository.
 ```
+
+```{exercise} Exercise: Practice creating commmits and branches (20 min)
+Make sure that you work now **on your fork** of the recipe-book repository.
+
+1. First create a branch and then add a recipe to the branch and commit the change.
+1. In a new commit, modify the recipe you just added.
+1. Switch to the `main` branch and modify a recipe there.
+1. Browse the network and locate the commits that you just created ("Insights" -> "Network").
+1. Compare the branch that you created with the `main` branch. Can you find an easy way to see the differences?
+1. Can you find a way to compare versions between two arbitrary commits in the repository?
+1. Try to rename the branch that you created and then browse the network again.
+```
+
+We will add to this page:
+- intro
+- screenshots
+- tab on how to do this locally
+- hints
+- solution
+- discussion
+- summary