This workshop content is over a year old and AWS Amplify has made a great deal of improvements since this content was originally written.
Instead of this content, please check out some of the more up-to-date Amplify content. One great example is the AWS Serverless Airline Booking project. Besides that, you can find lots more excellent AWS Amplify content on the AWS Amplify Community site.
If you would still like to review the content of this workshop, these instructions should still work, provided you use the specific version of AWS Amplify noted in the Prerequisites section.