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Assuming Apple continues its previous practices, once macOS 10.13 High Sierra comes out, it will become impossible to download 10.12 Sierra for the first time. That could be awkward if you want to upgrade an older Mac to Sierra at any point after High Sierra ships, since you won’t be able to get Sierra then.

To every thing there is a season, and we’re fast approaching the time when Apple harvests the fruit of the last year and releases new versions of macOS, iOS, watchOS, and tvOS. There are no major surprises here, since Apple announced the new versions in June and public betas have been available since that announcement. But once macOS 10.13 High Sierra, iOS 11, watchOS 4, and tvOS 11 become available for free download, you’ll need to decide when you’re going to install them.

For the most part, you never have to power down your trusty iPhone, but there are two rare situations where doing so might be useful. If your battery is getting low and you won’t be able to charge before you absolutely need the phone later in the day, turning it off will prevent it from running out of juice. Also, if your iPhone is being weird (it is a computer, after all!), power cycling can reset its little iPhone brain. To pull its virtual plug, press and hold the Sleep/Wake button until you get the necessary Slide to Power Off control.