You'll learn how to work with javascript objects, creating and setting properties, defining and using methods and the way objects are used in the Document Object Model (DOM). All while kicking serious zombie tuchus.
Speaking of the DOM you'll become comfortable working with it, selecting elements out of it, creating elements and adding them to it and removing any apocalyptic elements that might slip through.
Once you have all that under your post-apocalyptic utility belt you'll then be introduced to events, event handlers and how to utilize them.