Announcement: Upgrade to macOS Mojave

With features like Dark Mode, Stacks, and four new built-in apps, macOS Mojave helps you get more out of every click. 
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Question: Learning Mac OS

What is the best free source of Learning Mac OS ? I want to learn about different files and applications. How they do interact. Also learning about advance security on Mac ?

MacBook Pro with Retina display, iOS 11.1, Mac OS High Sierra

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Question: Learning Mac OS