What are the good teaching materials for digital photography portrait post-processing system learning?

"Photoshop digital photo processing skills" can also look at books about art and learn about various styles, so that it will change in post-processing, so that it is easy to make better choices.

Introduction to digital photography or digital SLR photography. It's all introductory. You can do it. Simple literacy. The system studies digital photography, and there is simple ps drawing in the later stage. The post-processing of Peng portrait in photography will choose the best composition.