What is fetch()? how did fetch() come about? why is fetch() important?
What is a promise? What are some examples of promises? and what should you be aware of when using promises?
What are class methods? how do you use class methods? what are some common default class methods you should know about.
What is a callback? How do you write callbacks? What are some examples of callbacks?
What is reduce? and how do you use reduce?
What are arrays of objects? how do you use arrays of objects? and ways to make arrays of objects.