Where is the repository I should fork?
Have a look at https://gitlab.mediacube.at/bjelline/git-kata
Where do I do this?
On the landing page of the repo in gitlab at the top there is a tab "Fork"
What is the end result of this step?
A copy of the repository in your own remote repo.
Why is it called "to fork"?
“To fork” means to copy a project to work on it independently. The term comes from a “fork in the road,” where one path splits into two.