delaying and repeating events based on time

making changes to the HTML with JavaScript

accessing the HTML via JavaScript

more about JavaScript with the "user agent"

containing chunks of code for later re-use

performing more powerful functions such as transforming and filtering arrays

collecting several items in one container

collecting properties and values into containers

grouping code into actionable chunks

making events happen again and again

making decisions with if and else statements

reviewing essential math + logic + beyond