I'm new to K2.  Can you tell me the advantage of using K2 over the normalcontent management system? 

 

I don't yet see any differences between the 2.

There are many differences, but the first one you see is (assuming you have sigpro and allvideos installed and working) that when a k2 item is created, there is a place for an item image, a video, attachments, and extra fields for the item.

There are many other features like acl.

 

K2 content system is way better than joomla's default.

You can have different template for every category and so so many other things that will make your life easier.

Just stick with it and you'll love it, 100%.