There are a lot of codes or short cuts on a mac book i have been looking at them and still can not remember all of them i got some of them not all not most just some it is a long list of codes or short cut to get them i tried to remember it lets see if u can remember them all.

Key combination	What it does
Command-Space	Show or hide the Spotlight search field (if multiple languages are installed, may rotate through enabled script systems)
Option-Command-Space	Show the Spotlight search results window (if multiple languages are installed, may rotate through keyboard layouts and input methods within a script)
Command-Tab	Move forward to the next most recently used application in a list of open applications
Shift-Command-Tab	Move backward through a list of open applications (sorted by recent use)
Shift-Tab	Navigate through controls in a reverse direction
Control-Tab	Move focus to the next grouping of controls in a dialog or the next table (when Tab moves to the next cell)
Shift-Control-Tab	Move focus to the previous grouping of controls
Command-esc	Open Front Row (if installed)
Option-Eject	Eject from secondary optical media drive (if one is installed)
Control-Eject	Show shutdown dialog
Option-Command-Eject	Put the computer to sleep
Control-Command-Eject	Quit all applications (after giving you a chance to save changes to open documents), then restart the computer
Control Option-Command-Eject	Quit all applications (after giving you a chance to save changes to open documents), then shut down the computer
fn-Delete	Forward Delete (on portable Macs' built-in keyboard)
Control-F1	Toggle full keyboard access on or off
Control-F2	Move focus to the menu bar
Control-F3	Move focus to the Dock
Control-F4	Move focus to the active (or next) window
Shift-Control-F4	Move focus to the previously active window
Control-F5	Move focus to the toolbar.
Control-F6	Move focus to the first (or next) panel
Shift-Control-F6	Move focus to the previous panel
Control-F7	Temporarily override the current keyboard access mode in windows and dialogs
F9	Tile or untile all open windows
F10	Tile or untile all open windows in the currently active application
F11	Hide or show all open windows
F12	Hide or display Dashboard
Command-`	Activate the next open window in the frontmost application
Shift-Command-`	Activate the previous open window in the frontmost application
Option-Command-`	Move focus to the window drawer
Command- - (minus)	Decrease the size of the selected item
Command-{	Left-align a selection
Command-}	Right-align a selection
Command-|	Center-align a selection
Command-:	Display the Spelling window
Command-;	Find misspelled words in the document
Command-,	Open the front application's preferences window (if it supports this keyboard shortcut)
Option-Control-Command-,	Decrease screen contrast
Option-Control-Command-.	Increase screen contrast
Command-?	Open the application's help in Help Viewer
Option-Command-/	Turn font smoothing on or off
Shift-Command-=	Increase the size of the selected item
Shift-Command-3	Capture the screen to a file
Shift-Control-Command-3	Capture the screen to the Clipboard
Shift-Command-4	Capture a selection to a file
Shift-Control-Command-4	Capture a selection to the Clipboard
Command-A	Highlight every item in a document or window, or all characters in a text field
Command-B	Boldface the selected text or toggle boldfaced text on and off
Command-C	Duplicate the selected data and store on the Clipboard
Shift-Command-C	Display the Colors window
Option-Command-C	Copy the style of the selected text
Control-Command-C	Copy the formatting settings of the selected item and store on the Clipboard
Option-Command-D	Show or hide the Dock
Command-Control D	Display the definition of the selected word in the Dictionary application
Command-E	Use the selection for a find
Command-F	Open a Find window
Option-Command-F	Move to the search field control
Command-G	Find the next occurrence of the selection
Shift-Command-G	Find the previous occurrence of the selection
Command-H	Hide the windows of the currently running application
Option-Command-H	Hide the windows of all other running applications
Command-I	Italicize the selected text or toggle italic text on or off
Option-Command-I	Display an inspector window
Command-J	Scroll to a selection
Command-M	Minimize the active window to the Dock
Option-Command-M	Minimize all windows of the active application to the Dock
Command-N	Create a new document in the frontmost application
Command-O	Display a dialog for choosing a document to open in the frontmost application
Command-P	Display the Print dialog
Shift-Command-P	Display a dialog for specifying printing parameters (Page Setup)
Command-Q	Quit the frontmost application
Command-S	Save the active document
Shift-Command-S	Display the Save As dialog
Command-T	Display the Fonts window
Option-Command-T	Show or hide a toolbar
Command-U	Underline the selected text or turn underlining on or off
Command-V	Paste the Clipboard contents at the insertion point
Option-Command-V	Apply the style of one object to the selected object (Paste Style)
Option-Shift-Command-V	Apply the style of the surrounding text to the inserted object (Paste and Match Style)
Control-Command-V	Apply formatting settings to the selected object (Paste Ruler Command)
Command-W	Close the frontmost window
Shift-Command-W	Close a file and its associated windows
Option-Command-W	Close all windows in the application without quitting it
Command-X	Remove the selection and store in the Clipboard
Command-Z	Undo previous command (some applications allow for multiple Undos)
Shift-Command-Z	Redo previous command (some applications allow for multiple Redos)
Control-Right Arrow	Move focus to another value or cell within a view, such as a table
Control-Left Arrow	Move focus to another value or cell within a view, such as a table
Control-Down Arrow	Move focus to another value or cell within a view, such as a table
Control-Up Arrow	Move focus to another value or cell within a view, such as a table
Shift-Command-Right Arrow	Select text between the insertion point and the end of the current line (*)
Shift-Command-Left Arrow	Select text between the insertion point and the beginning of the current line (*)
Shift-Right Arrow	Extend text selection one character to the right (*)
Shift-Left Arrow	Extend text selection one character to the left (*)
Shift-Command-Up Arrow	Select text between the insertion point and the beginning of the document (*)
Shift-Command-Down Arrow	Select text between the insertion point and the end of the document (*)
Shift-Up Arrow	Extend text selection to the line above, to the nearest character boundary at the same horizontal location (*)
Shift-Down Arrow	Extend text selection to the line below, to the nearest character boundary at the same horizontal location (*)
Shift-Option-Right Arrow	Extend text selection to the end of the current word, then to the end of the following word if pressed again (*)
Shift-Option-Left Arrow	Extend text selection to the beginning of the current word, then to the beginning of the following word if pressed again (*)
Shift-Option-Down Arrow	Extend text selection to the end of the current paragraph, then to the end of the following paragraph if pressed again (*)
Shift-Option-Up Arrow	Extend text selection to the beginning of the current paragraph, then to the beginning of the following paragraph if pressed again (*)
Control-Space	Toggle between the current and previous input sources
Option-Control-Space	Toggle through all enabled input sources
Command-Left Arrow	Change the keyboard layout to current layout of system script
Command-Right Arrow	Change the keyboard layout to current layout of Roman script
Option-Command-esc	Force Quit

(*) Note: If no text is selected, the extension begins at the insertion point. If text is selected by dragging, then the extension begins at the selection boundary. Reversing the direction of the selection deselects the appropriate unit.

Universal Access - VoiceOver keyboard commands

Key combination	What it does
Command-F5 or fn Command-F5	Turn VoiceOver on or off
Control Option-F8 or fn Control Option-F8	Open VoiceOver Utility
Control Option-F7 or fn Control Option-F7	Display VoiceOver menu
Control Option-; or fn Control Option-;	Enable/disable VoiceOver Control Option-lock
Option-Command-8 or fn Command-F11	Turn on Zoom
Option-Command-+	Zoom In
Option-Command- - (minus)	Zoom Out
Option-Control-Command-8	Invert/revert the screen colors
Control Option-Command-,	Reduce contrast
Control Option-Command-.	Increase contrast