If you’ve resisted requiring a password on your Mac after it wakes up or comes out of the screen saver because it’s too much work to enter repeatedly, an Apple Watch can make authentication much easier. In previous versions of macOS, just wearing an unlocked Apple Watch is enough to enter your Mac’s password; in Catalina, the Apple Watch can also enter your password when prompted by apps. First, make sure your Apple Watch has a passcode (in Watch > Passcode), is on your wrist, and is unlocked. Then, in System Preferences > Security & Privacy > General, select “Use your Apple Watch to unlock apps and your Mac.” From then on, most of the time your Mac or an app wants your password, your Apple Watch will provide it automatically. (This feature requires that the Mac dates from mid-2013 or later, that all devices use the same iCloud account, and that the Apple ID uses two-factor authentication instead of two-step verification.)
AirDrop has become a fast and reliable way to transfer data from one iPhone to another that’s nearby. Just tap the share icon and in iOS 13’s activity view, either tap an AirDrop shortcut in the top row or tap AirDrop in the second row and select choose a person or device in the subsequent AirDrop screen. But what if your iPhone doesn’t appear for the person who wants to share with you? Assuming Wi-Fi and Bluetooth are both on, the fix is generally to go to Settings > General > AirDrop and select Everyone. If you’re concerned about unwanted transfers, switch to Contacts Only afterward.