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A few attempts to clarify some mysteries about flash and digital photography basics, hopefully helpful. A little of it is Nikon-specific, however almost all subjects are general, not affected by brand at all.
Guide Numbers (with calculator)
Review of the Yongnuo YN-565EX Speedlight A less expensive alternative ($102, recommended)
Review of the Neewer NW-985N Speedlight Even less expensive
Review of the Neewer VK750 II Speedlight Less expensive yet ($54, recommended).
Comparisons of Optical Slave Triggers (for the SB-600 too)
How Light Meters Work (maybe not as assumed)
Details about Metering Principles (including TTL)
A Histogram is Not a Light Meter Incident meters vs. Reflected meters
Do I need a handheld light meter? Including Sekonic L308S
There are TWO types of Histograms The single histogram is Poor
Histograms are Gamma Encoded The numbers are probably not what you think
Nikon TTL BL with D Lens Distance Zoom lens distance accuracy is rather suspect
Nikon CLS Commander Wireless Remote Flash System (AWL), also including Part 2:
f/stops and shutter speeds Understanding numerical definitions, third, half, tenth stops
EV - Exposure Value and Chart, plus the Sunny 16 Rule
Memory Card Speed How much do we need?
Camera Exif Data Need a good Exif viewer?
Photo Editor Curve Tool (and levels and contrast and brightness and inversion...)
Main Scanning Menu - Scantips.com