There are many tips you’ll need in order to use your Mac more efficiently, regardless of your experience. Some of these will require recent versions of the Mac operating system (OS) such as the latest macOS Sierra – but not all of them do. (select any image to enlarge)
Make a keyboard shortcut for anything
Keyboard shortcuts are great for saving time, but you're not limited to just the shortcuts put in by developers. If there's a particular menu option you use all the time that doesn't have a shortcut, you can create it yourself.Go to System Preferences > Keyboard > Application Shortcuts. Click the + button to add a new shortcut. You can choose which app you want to apply it to from the drop-down list, but you must know the exact name of the menu command to type into the next box, including the correct case and any special characters such as ellipses. Lastly, choose a unique key combination to invoke the command, then click Add.
View someone's screen remotely
One really easy way to view someone else's screen or even control their Mac over the internet – which is invaluable if you're helping troubleshoot a relative's computer problems – is to launch Screen Sharing by searching for it with Spotlight then entering the Apple ID of the person you're trying to contact. (If you or they don't know it, just have them look in the iCloud pane of System Preferences. And while they're there, make sure Screen Sharing is enabled in the Sharing pane of System Preferences.)They'll be asked to grant you permission to view their screen, and they can also then click on the screen sharing icon in the menu bar and grant you the ability to virtually, remotely control their mouse and keyboard too.
Adjust the volume in smaller increments
When you use the volume up and down keys on your Mac's keyboard, the difference between one tap and the next can actually be pretty big – especially if you're driving some meaty external speakers. Hold down ⌥ and ⇧ as you tap those keys, though, and the increments become much smaller.And here's a bonus tip: if the audible feedback when you change the volume annoys you, you can turn it off in the Sound section of System Preferences, but, and here's the clever bit, you can temporarily toggle it back on by holding ⇧ when you change the volume – handy when you're not sure whether your Mac isn't making a noise because the system output is configured incorrectly or because the app you're trying to use is at fault.
Rename, duplicate and revert files easily
In OS X Lion, Apple introduced some new features for working with files, and a new hidden menu to access them. When you've opened a document, move your cursor over its name to bring up a small black arrow just to the right.Click this arrow and you bring up a menu with some of these new options. The most useful are the ability to rename and duplicate files, but you can also lock a file to prevent further editing, change it so that the file is stored in iCloud instead of only on your hard drive (though only in compatible apps), or move the file.
The flashiest feature is the ability to revert to a previous version of a file, though, you can choose an older version from what's listed in this menu, or click 'Browse All Versions…' to enter a Time Machine-like interface, where you can scroll through older versions of that file and compare them to the current one.
Cure an insomniac Mac
You might find that occasionally when you close your MacBook's lid or pick Sleep from the Apple menu on your iMac or Mac mini that it refuses to go to sleep.Happily, getting to the bottom of this problem is easy. Since Yosemite, you can chose from the View > Column menu when you're on Activity Monitor's CPU tab to show a column of processes that are preventing sleep. Click this column header to sort by it, and then you can easily find what apps are keeping your Mac awake, then quit them if necessary.
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Credit: techradar.com

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