Straightening and cropping, white balance.
Typical Portrait Retouching
Includes the minor retouching and also adjust contrast, tonal (color) adjustments, blemish removal (typically on close up portraits). Sharpening is applied as needed.
Using photoshop to perform more extensive edits to a photo. Examples of major editing include: swapping head (or other body part) from one image to another, slimming down a face, turning a grimace to a smile, background swap.