Photoshop is designed basically for photo processing and retouching, it needs to be taken into account that 80% of the features and options are intended for photography. It is not called Photoshop for nothing.
As a first approach to photo processing, in this new tutorial, we will address photo processing in terms of brightness and contrast.
Background birds sound: Dawn Chorus By Sean. Townsend From Freesound.org https://goo.gl/mPCoeJ licensed under CC BY 2.0 https://goo.gl/6ksKSF