Flash Facts and Skills

Part 1:
1: Every flash photograph is two exposures in one
2: Flash exposure is not affected by shutter speed 
3: Flash illumination is dramatically affected by distance 
4: Your camera measures ambient light and flash illumination separately. 
5: With automatic flash metering, the flash illumination is measured after the shutter button is pressed, and the flash output is adjusted accordingly.  
6: Every SLR camera with a mechanical shutter has a maximum flash sync shutter speed
7: (Applicable to modern electronic cameras only) If you set your shutter speed faster than flash sync, or use Av mode with an aperture setting that requires a shutter speed faster than flash sync for proper exposure  
 Part 2:
 http://www.lightstalking.com/thflash-photography
1.The further your subject, the more powerful flash you need.
2. The flash is not affected by shutter speed, it'll increase ambient light.
3. Not enough light to illuminate and reflect light back to camera.
4. The max sync speed is 1/200th
5. The guide number for an electronic flash is a way of quantifying it's maximum output in terms that a photographer can relate to aperture and distance.
6. The light can cause problems with shooting directly at the subject, by pointing the camera up you can bounce the light.
7. Can help you get rid of light by expanding it and moving it to the side and getting rid of it.
 Part 3:
 Explain what a "Rear Curtain Sync" or a "Slow Sync" exposure is. Why is this useful?
    A slow sync is a longer exposure and rear curtain sync creates a natural look