Computer Basics

Command
Shift
Option
Control
Caps Lock
Fn

Start with these:

Command + X    Cut the selected item and copy it to the Clipboard

Command + C    Copy the selected item to the Clipboard. This also works for files in the Finder.

Command + V    Paste the contents of the Clipboard into the current document or app. This also works for files in the Finder.

Command + C and Command + V Apple Mac Keyboard Shortcuts

If you learn just two Mac keyboard shortcuts in your lifetime, make them Command + C and Command + V.

Command + Z    Undo the previous command. You can then press Command + Shift + Z to Redo, reversing the undo command. In some apps, you can undo and redo multiple commands.

Command + A    Select All items.
    
Command + F    Find items in a document or open a Find window.

Command + G    Find Again: Find the next occurrence of the item previously found. To find the previous occurrence, press Command + Shift + G.

Command + H    Hide the windows of the front app. To view the front app but hide all other apps, press Command + Option + H.

Command + M    Minimize the front window to the Dock. To minimize all windows of the front app, press Command + Option + M.

Command + N    New: Open a new document or window.

Command + O    Open the selected item, or open a dialog to select a file to open.

Command + P    Print the current document.

Command + S    Save the current document.

Command + W    Close the front window. To close all windows of the app, press Command + Option + W.

Command + Q    Quit the app.

Command + Option + Esc    Force Quit: Choose an app to force quit. Or press Command + Shift + Option + Esc and hold for 3 seconds to force just the front app to quit.

Command + Space Bar    Spotlight: Show or hide the Spotlight search field. To perform a Spotlight search from a Finder window, press Command + Option + Space Bar. If you use multiple input sources to type in different languages, these shortcuts change input sources instead of showing Spotlight.

Space Bar    Quick Look: Use Quick Look to preview the selected item.

Power Button    Press to turn on your Mac or wake your Mac from sleep. 
Press and hold for 1.5 seconds while your Mac is awake to display a dialog asking if you want to sleep, restart, or shut down. 

Ctrl + Power Button     or Control + Media Eject     If you don’t want to wait 1.5 seconds, Press and hold for 5 seconds to force your Mac to turn off.

Control + Command + Power Button    Force your Mac to restart.

Control + Shift + Power Button    Put your displays to sleep.e folders that contain the current folder.

Plus dozens of other commands.  

Shortcut Keys    Description
Alt+F    File menu options in current program.
Alt+E    Open Edit options in current program.
Alt+Tab    Switch between open programs.
F1    View help information (F1 is used by almost every Windows program to display help).
F2    Rename a selected file.
F5    Refresh the current program window.
Ctrl+D    Bookmarks the current page in most Internet browsers.
Ctrl+N    Create a new or blank document in some software, or open a new tab in most Internet browsers.
Ctrl+O    Open a file in the current software.
Ctrl+A    Select all text.
Ctrl+B    Change selected text to be bold.
Ctrl+I    Change selected text to be in italics.
Ctrl+U    Change selected text to be underlined.
Ctrl+F    Open find window for current document or window.
Ctrl+S    Save current document file.
Ctrl+X    Cut selected item.
Shift+Del    Cut selected item.
Ctrl+C    Copy selected item.
Ctrl+Ins    Copy selected item
Ctrl+V    Paste
Shift+Ins    Paste
Ctrl+Y    Redo last action.
Ctrl+Z    Undo last action.
Ctrl+K    Insert hyperlink for selected text.
Ctrl+P    Print the current page or document.

 

Home    Goes to beginning of current line.
Ctrl+Home    Goes to beginning of document.
End    Goes to end of current line.
Ctrl+End    Goes to end of document.
Shift+Home    Highlights from current position to beginning of line.
Shift+End    Highlights from current position to end of line.

Ctrl+Left arrow    Moves one word to the left at a time.
Ctrl+Right arrow    Moves one word to the right at a time.
Ctrl+Esc    Open the Start menu.
Ctrl+Shift+Esc    Open Windows Task Manager.
Alt+F4    Close the currently active program.
Alt+Enter    Open the properties for the selected item (file, folder, shortcut, etc.).