Slow Sync Rear Curtain flash is a bit of a mouthful and sounds complicated. It's a technique for capturing movement blur within an image whilst still maintaining subject sharpness. You do need to know the basics of on camera flash control but it's not rocket science.
So from the top, slow sync means firing the flash during a slow shutter speed. Rear (or 2nd curtain) means setting the flash burst to fire at the end of an exposure just as the second shutter curtain is about to close. The sequence is shutter opens - light burns onto the sensor and some movement records as a blur - flash fires and lights the subject at the correct exposure freezing motion on the subject only - rear shutter curtain closes.
So what will the image look like? When done correctly the subject will have hints of motion around the edges but still be sharp and the background will be a bit dark but still have loads of detail and some movement blur. Oh just watch the video because that will explain it all much better...
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