Locked out of MacBook Air

Is this your user account password that you are referring to? If so, the following article should help:

• Change or reset the password of a macOS user account - Apple Support

rasika274 Said:

“Locked out of MacBook Air: I can’t remember my password for my MacBook Air - help!“

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If Using the Correct Password is Not Going Through... Then, Two Thoughts:

• Use an External Keyboard: First shut down the Mac > plug in the external keyboard > try this login once more.

or...

• Reset: your SMC along with your NVRAM

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Elsewise, if neither is of success, then Reinstall Mojave, from a:)

• Time Machine Backup

or...

• Bootable Installer