New composition

Ctrl+N

Command+N

Open Composition Settings dialog box for selected composition

Ctrl+K

Command+K

Set composition background color

Ctrl+Shift+B

Command+Shift+B

Set beginning or end of work area to current time

B or N

B or N

Set work area to duration of selected layers or, if no layers are selected, set work area to composition duration

Ctrl+Alt+B

Command+Option+B