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What's the Difference between event.preventDefault() and return false in jQuery.

The https://forums.macrumors.com/forums/web-design-and-development.58/ would be the more appropriate forum for this. ;)

event.preventDefault() cancels the default behavior, submitting a form on click or clicking a link.

Return false prevents events from bubbling up the DOM tree, therefore could be seen as follows:
Code:
function(e) {
  e.preventDefault();
  e.stopPropagation();
}

More on events can be read on Peter-Paul Kochs blog: http://www.quirksmode.org/js/events_order.html
 
You can read into why later; if you're newer to programming just always use preventDefault();
 
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