Locked out of my new Mac air laptop
I changed my password on my Mac air laptop and locked myself out of my computer.
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I understand you are not able to log into your Mac.
Despite the fact you changed your login password and are certain you know the new one, If you forgot your Mac login password - Apple Support describes what to do, including options If you can't reset your Mac login password.
Follow all those steps all the way through to the end.
For reference: Change the login password on Mac - Apple Support