Opening files or starting a new file.
Zooming in and out
Basic Tools
The control panel (at the top)
Layer's panel
The difference between file types (.jpg, .png, .psd)
Saving files and making copies
Save a photoshop layers document in progress
Saving for web
Making layers
Making adjustment layers
Copying layers
Deleting layers
Reordering or hiding a layer
Using levels to adjust lighting (fixing shadows, midtones, and highlights)
Curves (adjust shadows, midtones, and highlights separately or change contrast)
Colour (adjust hue, saturation, and value/lightness)
Vibrance, Black and White
Backing up with keyboard shortcuts
Auto adjustments
Unsharp mask
Reduce noise