Around the year 2006, David Hobby started a very popular blog called strobist.com. Its main purpose is teaching how to use off-camera flash. Due to the exploding market aroused by the evolution of the digital camera, photography was accessible to the larger public and many of them became interested in exploring the world of light.
Basically it gives ideas about how to use small portable flashes, those ones you normally put on the camera, but off-camera. This creates a wide range of new possibilities and outputs.
The light can be enhanced through different modifiers. The best news is it doesn't necessarily have to be expensive. Many modifiers can be made yourself and moreover, there are lots of cheap new products available from China.
All in all, the most important part is to understand how to use the light and the camera, since a fool with a tool, is still... a fool!