The difference between a "Shuvit" and a "Pop-Shuvit" is, of course, the pop. In a Pop Shuvit, the skateboard pops into the air and spins around. In a Shuvit, you don't need to know how to Ollie. A Pop Shuvit is a combination of a Shuvit and an Ollie (sometimes called "Ollie Shuvits", but ... just don't call it that!).
I know I say this in each skateboarding trick tip walkthrough, but it really does help! If you are brand new to skateboarding, you may want to take some time getting used to riding your skateboard (read Just Starting Out Skateboarding) before learning to do a Backside Pop Shuvit. Of course, it is totally up to you – if you are aggressive and want to learn to Pop Shuvit on your skateboard before learning how to actually ride, that’s up to you!
Make sure you read all of these instructions before you try to Pop Shuvit. Once you are familiar with them, go out and do it!