What does the master password do?

How do users who change their own account passwords on the local Mac computer affect their login keychains?

For a user account with an Apple ID password, what options are available when you try to change the password?

What methods can be used to reset a lost user account password?

How does resetting a user’s account password affect that user’s login keychain?

How does the Firmware Password Utility help prevent users from making unauthorized password changes?