If you are recent MAC user you might find this Keyboard Shortcuts article useful

File Operations
ActionKey Command
To open a file [command] + [O]
To close a file [command] + [W]
To save a file [command] + [S]
To print a file [command] + [P]
To open a new document [command] + [N]

Edit Operations
ActionKey Command
Cut [command] + [X]
Copy [command] + [C]Paste[command] + [V]Check spelling[F7]
Bold text [command] + [B]Italicize text[command] + [I]
Remove text formatting [control] + [spacebar]

Selecting Text
ActionKey Command
Select all [command] + [A]
Select one character to the right [shift] + [right arrow]
Select one character to the left [shift] + [left arrow]
Select to the beginning of a word [shift] + [option] + [left arrow]
Select to the end of a word [shift] +[option] + [right arrow]
Select to the end of the line [shift] + [end]
Select to the beginning of the line [shift] + [home]
Select one line down [shift] + [down arrow]
Select one line up [shift] + [up arrow]
Select to the end of the paragraph [command] + [shift] + [down arrow]
Select to the beginning of the paragraph [command] + [shift] + [up arrow]
Select one screen down [shift] + [page down]
Select one screen up [shift] + [page up]
Select to the beginning of the document [command] + [shift] + [home]
Select to the end of the document [command] + [shift] + [end]

Undo And Redo Option
ActionKey Command
To undo previous action[command] + [Z]
To redo previous action[command] + [Y]
To cancel any action[esc]

Current File Navigation
ActionKey Command
Move one character to the left [left arrow]
Move one character to the right [right arrow]
Move one word to the left [option] + [left arrow]
Move one word to the right [option] + [right arrow]
Move one paragraph up [option] + [up arrow]
Move one paragraph down [option] + [down arrow]
Move up one line [up arrow]
Move down one line [down arrow]
Move to the end of one line [end]
Move to the beginning of one line [home]
Move one screen up [page up]
Move one screen down [page down]
Move to the top of the next page [command] + [page down]
Move to the top of the previous page [command] + [page up]
Move to the end of the document [command] + [end]
Move to the beginning of the document [command] + [home]
Move to the next document window [command] + [F6]
Move to the previous document window [command] + [shift] + [F6]

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