Light is everything in photography, it doesn’t matter whether the source is natural or manmade, to take images for uniqueness understanding the light source is important.
This page is intended to help shed some light on the subject (Pun intended)
Natural Lighting
Speed Lights & Stobes
Light Modifiers
Karl Taylor on basic lighting
Pye and SLR Lounge: Master the Exposure Triangle Understanding Exposure
Chris Bray, Lighting made EASY: Type, Direction, Flash, White Balance, Filters
 Photography Lighting for Beginners: 3 Lighting Essentials For Creating Incredible Images
 Top 10 Lighting Facts Beginner Photographers Need to Know
 How to Use Light in Photography
 The Exposure Triangle – A Beginner’s Guide