Every operating system has its own hidden quirks that aren't obvious at first, only way to usually find them is to read the manual but really no one ever reads the manual thoroughly. When you buy a Mac, you aren't even given a manual in the box, you have to go find it on Apple's support site.Recommend: You can use Syncios Free iOS manager to backup all your iPhone/iPad/iPod messages, contacts, call logs, photos, apps and more for totally free. Get rid of iTunes entirely! Learn more from here.
The Mac has always had some awesome tricks that not everyone knows. Here are some not so obvious things you can do with your Mac.
1. Ctrl + Cmd + Spacebar brings up the full emoji keyboard.
2. Cmd + ~ allows you to quickly switch through windows on the current application you're on.
3. Shift + Option will give you the ability to more finely adjust the volume.
4. Holding down Shift when changing the volume will mute the volume clicker.
5. Cmd + L will highlight the URL bar in your browser.
6. Cmd + Shift + 3 will take a screenshot.
7. Cmd + Shift + 4 will let you take a cropped screenshot.
8. Cmd + Shift + 4 + Spacebar will let you take a screenshot of a specific window.
9. Using 'Preview' you can digitally sign documents.