Shortcut keys in a Mac

There are four main modifier keys in Mac, Command,control,option and shift, each of which has its own pattern of four keys.

Basic shortcut keys
command is the most important modifier key on your Mac, which in most cases is equivalent to CTRL under Windows
Command-z Revocation
Command-x Cut
Command-c Copy (copy)
Command-v paste
Command-a full selection (All)
Command-s Saving (Save)
Command-f Search (Find)
Command-shift-3 intercept all screens to file
Command-shift-control-3 intercept all screens to clipboard
Command-shift-4 intercepts the selected screen area to a file, or presses the SPACEBAR to capture only one window
Command-shift-control-4 intercepts the selected screen area to the Clipboard, or presses the SPACEBAR to capture only one window

Mac Startup and shutdown
Option to press immediately after power on, the boot manager will be displayed, if the MAC is equipped with a dual system or a bootable USB flash drive, you can select the Startup disk in the boot manager
Command-r Press immediately after power on to turn on OS X recovery (Recovery)
Command-option-p-r immediately after power-on, reset NVRAM. Sometimes the computer will have some minor problems, resetting NVRAM is your first choice in addition to restarting and trying to fix it.
command-option-control-power button Exits all applications, allows you to save documents, then shuts down
Press and hold the power button for 5 seconds to force the Mac to shut down

In the application
Command-h Hiding (hide) the currently running application window
Command-option-h hiding (hide) Other application windows
Command-q exit (quit) the front-most application
Command-shift-z redo, that is, reverse operation of undo
Command-tab in the Open Applications list to the next most recently used application, equivalent to Windows (ALT + TAB)
Command-option-esc Open the Force exit window and, if an application is unresponsive, select Force exit in the window list

Text Processing
Command-b Toggle the selected text bold display
Fn-delete is equivalent to delete on the PC full-size keyboard, which is deleted backwards
fn-up Arrows up one page (page UP)
fn-down arrow Scroll down one page (page down)
fn-LEFT ARROW Scroll to beginning of document (Home)
fn-RIGHT ARROW scroll to end of document (end)
Command-RIGHT ARROW moves the cursor to the end of the current line
Command-LEFT ARROW moves the cursor to the beginning of the current line
Command-down ARROW moves the cursor to the end of the document
Command-up ARROW moves the cursor to the beginning of the document
option-RIGHT ARROW moves the cursor to the end of the next word
Option-LEFT ARROW moves the cursor to the beginning of the previous word
Control-a move to the beginning of a line or paragraph

In the Finder
Command-shift-n Creating a new folder (new)
Command-shift-g window, can enter absolute path Direct folder (Go)
Return this is not really shortcut keys, click on the file, press to rename the file
Command-o Open the selected item. Open file in Mac not like Windows directly press ENTER
Command-option-v function is equivalent to file clipping in Windows. Copy the file (command-c) to a different location, press this shortcut at the destination and the file will be clipped to this location
Command-up Arrow opens the folder containing the current folder, which is equivalent to "up" in Windows
Command-delete moving files to the Trash
Command-shift-delete emptying the wastepaper basket
Spacebar to quickly view the selected file, which is the preview feature

In the browser
Command-l cursor jumps directly to the address bar
Control-tab Turn to next tab page
Control-shift-tab Turn to previous tab page
command-Plus or equal sign Enlarge page
command-minus Zoom Page

Shortcut keys in a Mac