cant update password after updating to big sur

User wrote " Does anyone know how to update the password after upgrading to big sur? I wont let me login at all "

Correct me if you would.

Is one taking of Resetting the Computer Password - if so - authenticating to host server is not involved in this process.

If one is talking about Resetting Apple ID Password - that is a different matter. If you forgot your Apple ID password

Reset Computer Password 

Intel Computer

1 - Restart computer and immediately hold Command + r keys

2 - Top Tool Bar >> Utilities >> Terminal

3 - Type resetpassword as one word and no spaces

4 - Press Return key

5 - Follow the prompts and remember the New Password

Apple Silicon M1 Computer 

1 - Choose Apple menu > > Shut Down.

2 - Press and hold the power button on your Mac until you see “Loading startup options.”

3 - Click Options, then click Continue. 

4 - Top Tool Bar >> Utilities >> Terminal

5 - Type resetpassword as one word and no spaces

6 - Press Return key

7 - Follow the prompts and remember the New Password