the following is a simple outline of what you will learn in each level:

level 0:
-tools
-simple functions
-layers
-finding images

level 1:
-cutting
-mane, tail, fetlock, forelock, overall fuzziness smuding

level 2:
-text effects
-textures
-scanlines
-picture effects

level 3:
-blending (3 methods, fading one pic ontop of another, fading edges to create a seamless blend of pictures, combining backgrounds)
-brushes
-body smudging

level 4:
-colourizing
-fog
-rain
-shadows

level 5:
-cloning
-removing tack
-adding appendages (wings, horns, etc)

level 6:
-replacement
-water effects

level 7:
-overall perfection
-digitally painting addons, body parts, hair, etc

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random (these are not required to be taught, but if you [the student] wants to learn it, they are welcome to pm or post to their or another teacher, or post in the tutorial section):
-animations
-vectoring
-vexelling
-linearts
-digital paintings