Cropping

Use of Layers

Contrast and Density Change

Color Balance

Image Rotation

Burning and Dodging

Saturating and De-Saturating

Text Tool

Vignetting

Gradient

Combining Images with the Pen Tool

Transposing Images Using Opacity

Spot Healing and Healing Brush

Magnetic and Regular Lasso Tool

Magic Wand

Clone Tool

Clipping Mask