Create a group

Shift-Command-N

Bring the object to the top of the group

Command–Right Bracket (])

Send the object to the bottom of the group

Command–Left Bracket ([)

Bring the object up one level in the Layers list

Command–Right Bracket (])

Send the object down one level in the Layers list

Command–Left Bracket ([)

Place the selected objects in a new group

Shift-Command-G

Ungroup a group of objects so you can manipulate each object

Option-Command-G

Make the object active or deactivate the object

Control-T

Enable/disable the Solo button of a selected track

Control-S

Isolate the selected group or layer

Control-I

Lock/unlock an object

Control-L

Move up one level in the Layers list

Up Arrow

Move down one level in the Layers list

Down Arrow

Expand a group in the Layers list

Option–Left Arrow

Collapse a group in the Layers list

Option–Right Arrow

Import

Command-I

Add an image mask to the selected object

Shift-Command-M

Convert the applied behaviors to keyframes

Command-K

Open the Media list and Inspector to reveal the source and properties of media objects

Shift-F

Clone the selected layer

K