HT201240 My administrator login password no longer works on MacBook Pro - what do I do?

I have not changed my password, the caps lock is not on, I was able to log in this morning, turned off my MacBook, turned it back on this evening and the password is no longer working. How can I go about fixing this when I am not able to login to my administrator account?
Thank you!

I would first try and reset the Admin password by the method shown in the article below.
Changing or resetting an account password

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HT201240 My administrator login password no longer works on MacBook Pro - what do I do?

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