Keyboard shortcuts from the lesson:

Alt+Backspace — fill with the main color
D — return the default colors
X — switch between the selected colors
Ctrl+i — invert the mask
\ — highlighting the mask with a color
Alt + click on the mask — view the mask
Ctrl + Z — undo the last action
Ctrl + J — duplicate layer
Ctrl + T — transformation
Alt + click on the mask — create a black mask
Alt + drag — copy of the mask
Alt + click between layers — create a clipping mask