To set up a passkey on your phone, use your camera app to scan a QR code. For a security key (e.g., YubiKey or Google Titan Security Key), insert it into your PC. These screenshots show what the setup ...
Suggestions for delaying and limiting devices while still letting your kids participate in the modern world of technology.
If you use an iPhone, Apple's built-in password manager can be a godsend since it can assign and store unique credentials for all your apps and services.