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 to cope with a Photos library too big to fit on an internal Mac drive

Apple doesn’t offer the perfect mix of choices with iCloud Photos, and the right answer isn’t obvious.

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How to conserve mobile data by turning off iTunes and other downloads in iOS

These settings aren’t hidden, but they can pack a wallop.

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How to add other people’s fingerprints to Touch ID

It’s a great way to allow casual use within a family.

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Can you opt out a Mac for iCloud Photos? Yes, but click carefully

If you have multiple Macs, you may not want them all to sync with iCloud Photos.

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How to change your music files’ metadata information using iTunes for Mac

Be warned: You can fix errors or set information, but it’s a one-way street. Here’s how to prepare.

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What happens when you delete an album in the Mac’s Photos app?

Here's an explanation on how to make sure you've actually deleted a photo in Apple's Photos app for Mac.

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Is your router’s Wi-Fi working but ethernet has gone bad? Here’s how to check

Ethernet is often the literal weakest link in a Wi-Fi network.

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How to fix a grayed-out Safari home page preference

The Safari option for picking your home page can be hijacked.

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How to get photos to appear in an Open dialog in macOS when they’re missing

Apple’s Media Browser can sometimes have hiccups that require fixes.

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How to convert vector artwork into different formats using the Preview app

You may have an SVG, PDF, or EPS file that you want to use as a bitmap image. Here’s how you can do that in Preview.

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How to export your Photo Booth photos and videos

Here are the three methods you can use to get your photos and videos out of the Photo Booth app on your Mac.

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How to use and troubleshoot AirDrop for simple file transfers and handoffs

AirDrop is a handy feature for quickly transferring data between iPhones, iPads, and Macs. Here’s how to make proper use of it.

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How to troubleshoot and fix strange website errors with macOS Safari

If something is amiss is when you visit a website you use routinely, here’s what you can do.

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How to delete a file that macOS says is in use

There’s an override for files you can’t delete, but take care.