For this tutorial we'll be following along with a Guide from Mozilla:
I'm going to walk us through creating the app, but I wanted you to have the guide that we'll be working from. It is typical as a software developer for you to follow a guide like this to learn a new framework and get familiar with a new tool. These are usually written with pros in mind, so I'll help fill in some blanks and give you some tips on things I would change.
You can view a live demo of the app we'll be creating at https://mdn.github.io/todo-react-build/.