Glenn FleishmanSenior Contributor, Macworld

Glenn Fleishman is the author of dozens of books, including Take Control of Wi-Fi Networking and Security (updated for iOS/iPadOS 13 and Catalina), a detailed guide to wireless networking and security. He's a senior contributor to Macworld, where he writes Mac 911.

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How to move a user account from one Mac to another

The Migration Assistant app can be used to transfer an account from one Mac to another.

Wi-Fi tools

Does AirPort Utility see AirPort base stations that aren’t yours? Here’s what you can do

If an ISP sets up their network insecurely, you could see other networks.

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How to rotate an image uploaded to iCloud Photo Library

Sometimes pictures get rotated out of whack. You can fix it in Photos.

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How to restore a deleted shared album in Photos

You can’t undo a deletion, but you can re-create it if you make a sort of backup.

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Is your Mac showing random black boxes in photos? Here’s the fix

It’s seemingly rare, but a glitchy GPU can pockmark your photo’s appearance.

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How to find the original timestamp on your photos after changing it

If you erred in modifying the date a picture was taken, you can fix it with some effort.

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MacOS: How to change the default app for a file

If you want a different app to always open a particular file type, here's how to do it.

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How to avoid losing media when working with iCloud Photo Library

What you should know about how iCloud Photo Library works, and how not to lose anything.

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How to move multiple Safari tabs at once in macOS

Spoiler: you can’t! But there’s a workaround.

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How to export an image and a video out of a HEIF Live Photo via macOS

It’s a neat trick if you want the moving portion of the Live Photo.

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How to make sure you don’t delete referenced images in Photos for macOS

You can choose to reference instead of copying images into the Photos library, but that makes it possible to delete them accidentally, too.

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McAfee Total Protection for Mac review: Good at detecting malware, but lacks active ransomware protection

This antivirus software package offers good basic protection, but its normal subscription price and its lack of ransomware protection allow its competitors to outshine it.

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How to prepare a Mac for sale or a return to an employer

When you need to give up or sell a Mac, how can you make sure you keep what you need and leave a wiped machine?

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How to disable Apple’s HEIF and HEVC formats in iOS

The more-efficient formats aren’t compatible outside of the newest Apple ecosystems, and some users prefer compatibility.

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What to do when your two-step Apple ID account is locked

Preparation is key to be able to get access to your device.