Gimped! Gimp Tutorials - All About Layer Masks (Gimped! Gimp Essentials Book 2)
Layer masking is one of the best tools for removing objects from their background in a way that doesn't destroy your photo.
This book will teach you how to use gimp to quickly isolate some of the trickiest things from the backgound, such as hair, leaves, a skyline, flowers, and a lot more. This isolation is an important first step toward doing more involved edits that professionals make.