What is fetch()? how did fetch() come about? why is fetch() important?
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.
What is an object? how do you create an object? and what's the difference between the different object creation methods