Here are some commonly used keyboard shortcuts:
Copy:
Command+C
Cut:
Command+X
Paste:
Command+V
Undo:
Command+Z
Select All:
Command+A
Open:
Command+O
Close:
Command+W
Save:
Command+S
Save As:
Command+Shift+S
Print:
Command+P
Dictionary:
Command+Control+D
(put your mouse over a word while holding those keys and it will display the definition)
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