How to use labs?

I have just started going over the k8s course where I wonder - is there any tutorial to using labs? Do we simply need to use the Linux terminal for that? For example, I am tasked to modify a file - should I do it in any way I would prefer? For example, using nano, or do you expect something special?

For most of our courses, we have an interactive on-line environment where you will find a terminal, and some way to edit anything you need to submit. It’s pretty cool. Here’s a guide on getting yourself set up.