Glenn FleishmanSenior Contributor, Macworld

Glenn Fleishman is the author of dozens of books, including his newly released Take Control of Your Apple ID, a guide to troubleshooting Apple ID problems and managing security and the features. He's a senior contributor to Macworld, where he writes Mac 911.

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How’s your iPhone battery health? Use the Battery settings to find out

Apple added and improved tools to check on battery usage and its current state.

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How to save email downloaded to an iPhone or iPad via POP3 or a local iOS mail folder

iOS backups don’t include email, but you can copy to a synced IMAP email account.

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What to do when the Mac App Store says ‘Update Unavailable with This Apple ID’

You may see this even when you haven’t changed your Apple ID when downloading or purchasing apps on your Mac.

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How to use iCloud for continuity when restoring from an iOS backup

iCloud can be a useful tool when you need to restore an iPhone or iPad from an iOS backup.

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Online security tools: The holiday gift that shows you really care

With website breeches happenings at a blistering pace and people creating more and more online accounts, giving the gift of security can save a lot of headaches.

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Your Mac won’t type U, I, O, J, K, L, and M? Here’s why

The vestiges of Num Lock remain in macOS in a newer feature, Mouse Keys.

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Why you should use a VPN on a public Wi-Fi network

A VPN effectively prevents even a network operator from peeping your activities.

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How to restore missing photos after downgrading iCloud storage

Those missing images aren’t gone for good if you act quickly.

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How to modify iOS Notifications settings at the lock screen

If you’re tired of a particular app posting notifications, you don’t have to drill down.

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What method should you use to make sure your iOS photos are backed up?

It’s not always crystal clear how photos on an iOS device make their way to a backup. Here's how to make sure your photos are backed up.

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How to use Universal Clipboard with a password manager to cut-and-paste between macOS and iOS

A hidden treasure lets you silently, briefly pass items between and among iOS and macOS.

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How to free up storage by deleting iTunes backups of iOS devices

If you use iTunes for backing up your iPhone or iPad, those backups add up and occupy your Mac's storage device.

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How to use Migration Assistant to move a user account to another Mac

Apple makes it easy to transfer a user’s account and data from Mac to Mac. Here’s how.

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Which backup method should you use for making constant archives of your data?

Not all automatic backup methods use the same frequency. Here are the advantages and disadvantages of file sync services, local backups, and internet-based services.

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How to shift an email address from one Apple ID to another

You can move a non-Apple-provided email address from one Apple ID account to another with a little effort.