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A major change in macOS 10.13 High Sierra is the switch to Apple’s new Apple File System, or APFS. With any luck, you’ll barely notice the change, just as almost no one did earlier this year when Apple updated millions of iOS devices to APFS with iOS 10.3. But let’s unpack what APFS is, why you should care, and what gotchas you might encounter.

Finding good Internet access for your Mac or Wi-Fi-only iPad while traveling can be maddening. Look in your Wi-Fi menu while sitting in an airport and you’ll see a bunch of networks, most of which require a password or won’t connect for other reasons. It isn’t any better when you reach your destination, since many hotels charge usurious rates for Wi-Fi. And while you might be able to find a coffee shop with free public Wi-Fi, those networks may not be secure—a hacker on the same network could watch your unencrypted Internet traffic.

If you’re over 40, you probably remember the point in The Wizard of Oz where the movie switches from black-and-white to Technicolor (and if not, go see it!). It wasn’t the first color film, but the vibrant images of Dorothy’s ruby slippers, the yellow brick road, and the Emerald City helped make the movie an instant classic.