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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)
Pixels, Printers, Video - What's With That? The Basic Fundamentals about Using images
Image Resize - Cropping, Resampling, Scaling including Aspect Ratio
White Balance Correction Click on White things
Why Should I Shoot Raw? The easiest way to go
Review of Yongnuo YN-565EX Speedlight A less expensive alternative ($84, recommended)
Review of Aperlite YH-700N Speedlight with HSS and Commander Master ($90)
Review of Neewer NW-985N Speedlight Even less expensive ($63)
Review of Neewer VK750 II Speedlight Less expensive yet ($54, recommended).
Nikon TTL BL with D-Lens Distance Zoom lens distance accuracy is rather suspect
Third Party Flash Brands Bypass D-Lens Distance Problems Accuracy of zoom lenses, and hot shoe cords
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 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