If you're going through this as an e-book you may benefit from spending 15 or so minutes going through the tutorials on the KnockoutJS website. If you're in a workshop then you can ignore this.
The KnockoutJS website is the best learning resource. We suggest doing the following two tutorials:
Once you've completed these you'll have enough knowledge for the rest of this workshop.
If you get stuck at any point - during this exercies or any future ones - please just ask for help. It's what we're here for.
We'll be heading around and getting your GitHub usernames so we can give you permission to the repository for the application you'll be working on.