Direction

What is front light good for?
Front light is good for capturing detail in a photo.

What is front light bad for?
Washing out people and backround detail.

What is side light good for?
Side light is good for depth.

What is side light bad for?
Detail.

What is back light good for?
Creating interesting sillouetts of people and giving the photo an interesting mood.

What is a possible problem with back light?
The photo would lack detail and possibly come out to dark.