Differences between file-based keychains including the login keychain, and Data Protection keychain. How the Passwords app in Sequoia caters for the latter.
passkey
macOS has two types of keychain, and its tools for working with them, Keychain Access and the command tool security, only work fully with one type.
Contrasts how passwords and passkeys work, and how passkeys can be protected using iCloud, and Apple’s iCloud keychain escrow.