Hi,
In a separate tab, you can open below exercise sandbox (from the prerequisite module) to use:
https://video2.skills-academy.com/en-us/training/modules/intro-to-git/2-exercise-configure-git
Once you get to Unit 5 Exercise there is a sandbox as well.
Please click Accept Answer and upvote if the above was helpful. If something is unclear add a comment below.
Thanks.
-TP