Compose Email (⌘ + Shift + I)
If you ever find yourself needing to compose an email quickly, just use the movie combination ⌘ + Shift + I. This will open the compose page on Mail for Mac OS, allowing you to compose your message right away. Instead of just taking you to the mailbox site.
Define word definition (⌘ + Control + D)
Mac OS X and iOS allow you to define definitions for words in bold. To do this via a set of Mac keyboard shortcuts, simply highlight (even if not highlight) any part of the word you want to recognize, then press ⌘ + Control + D.
Specify your screenshot (⌘ + Shift + 4)
You can use the key combination ⌘ + Shift + 3 to take a screenshot of your Mac's screen. This is a command that is used almost every day. However, if you just want to take a screenshot of a certain part of the screen, just combine + Shift + 4, click and drag the part you want to screenshot, then a snapshot will appear, and the captured screen will appear.
Minimize window screen (⌘ + Option + M)
If you want to minimize the window you're working on, you can quickly do this with the keyboard shortcut ⌘ + Option + M .
Quickly open a running application (⌘ + Shift + Tab)
If you have multiple applications open at the same time, you can quickly access one of them by pressing the key combination ⌘ + Shift + Tab.
Quit the window in Safari (⌘ + W)
If you want to quit a web window in Safari, you can press the key combination ⌘ + W, which also works for many other windowed apps.
Display the main screen interface + F3
If there are many windows open on the screen, but you want to return to the main screen of the device to search for applications or files, you can press the combination key + F3, and the screen will return to the main interface, as shown in the figure below.
Detailed volume adjustment (Option+Shift+F11 or F12)
If you just press F10 or F11, you have to adjust the volume in large steps, but when you press Option+Shift+F11 or F12, you can adjust the volume in very small steps, half the original size.
Delete all words (Option + Delete)
If you don't want to have to hold down the delete button until the entire word you typed is deleted, you can press Option + Delete to delete everything you just typed.
Scroll up and down quickly in a web page (⌘ + up or down)
There are many ways to move up and down a web page, such as clicking the scroll bar on the left side of the screen, using the trackpad, or you can use the arrow keys. However, when you press ⌘ + and the up or down arrow keys, you'll be dragging the web page up and down the screen very quickly.
Create a slow motion effect when minimizing a window (Shift + minimize icon)
If you want to try out the cool super slow window shrink effect on Mac OS, you can hold down the Shift key and hold down the dash in the yellow circle in the upper left corner of that window to shrink it extremely.
Access the address bar (⌘ + Up + L)
If you want to type in the web search bar without using your mouse, just press + Up Arrow + L and you'll be taken directly to the site's search or path registration in no time. .
Quick Shutdown (Control + Option + ⌘ + Eject)
If you find yourself needing to shut down your computer immediately, you can press the Control + Option + ⌘ + Eject button combination.
Finder shortcut (⌘ + Shift + A, U, or D)
The Finder, the Mac's file and application hub, is also cluttered, so you can use the keyboard shortcut ⌘ + Shift + A to quickly access the Finder's applications page, and the keyboard shortcut ⌘ + Shift + U to take you to Utilities and ⌘ + Shift + D will "escort" you to the Finder's Desktop folder.
Inverting colors might be a cool feature to some, but to others it's not as important. That's why this feature is hidden, you have to go to System Preferences (the gear icon in the app bar) > Keyboard > Shortcuts > Accessibility, tick "Invert Colors" and press ⌘ + Control + Option + 8 Change interface color and vice versa.