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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macOS Catalina: How to keep your internet radio favorites playing in the Music app

Apple has deleted the Internet Radio list, but still plays streams.

A MacBook running macOS Catalina.

How to stop getting a reminder to update to Catalina in macOS

If you’re not ready, you may not want the reminder.

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How to delete photos, links, and attachments from conversations in Messages

You can delete items you don’t want to keep or that you want to remove from taking up storage.

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Got a 32-bit app in Catalina? You don’t have to delete it

They won’t work, but you can choose to leave them in place.

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How to selectively choose what photos sync in Photos for Mac

The trick is using the Referenced File feature, which is a preference you can toggle at will inside the app.

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Where did that go? Find the parts of iTunes now spread throughout different apps in macOS Catalina

iTunes is dead. But the severed parts remain if you know where to find them.

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Can’t find your Time Machine backup after upgrading to Catalina? Look for a backupbundle

Time Machine typically creates a disk image you can mount to access files.

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iPhoto users, you’re out of time with macOS Catalina. What’s your next step?

Apple discontinued updates to iPhoto years ago, but not everyone migrated to Photos. Now you almost have to.

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How to switch from iCloud Photos to just plain Photos

Some folks don’t want to the recurring cost of iCloud. They can go local.

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How iCloud Drive works with multiple users on a single Mac

Fast user switching keeps users logged in and their activities running even though they’re not frontmost, including sync.

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That’s right: You can’t turn off Personal Hotspot in iOS 13 and iPadOS 13

A change in philosophy has removed an off switch.

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How to take advantage of the photo-editing tools in iOS 13 and iPadOS 13

Refreshed editing tools finally make on-device editing within the Photos app a pleasure instead of a slog.

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How to use the over-capture feature in the new iPhone camera to crop and adjust images later

Apple added a way to capture details outside your frame camera preview to aid in adjusting a picture after you snap the virtual shutter.

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Why you’re prompted to erase an external drive when you use it with Time Machine

Time Machine requires that the drive be in a certain format.