This book is a wonderful guide to photography composition, the first thing to learn as a photographer. 
 
The principles are easy to follow with bullet point summaries and easy to follow photography exercises for practicing and intergrating the principle into your view point.
 
7 Principles covered
1. Centre of Interest
2. The Thirds Rule
3. Color - which colors harmonize
4. Framing
5. Leading Line
6. Perspective
7. Depth of Field
 
This book follows the lessons taught in Luca's Photography Composition Course.