First off, if you haven’t upgraded to macOS Ventura go to System Preferences > Software Update and click "Upgrade Now"
Upgrade to macOS Ventura
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How to Use iPhone as your webcam
Bring your iPhone (11 and later) close to your Mac and it automatically switches to iPhone as the camera input.
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10 New macOS Ventura Features You Should Know About
Guide to macOS Ventura's best features including Continuity Camera, Stage Manager, Focus modes, and Mail improvements