Mac pc login

If you mean on startup…

See: Set your Mac to automatically log in during startup

Reset your login password using your Apple ID

If you associated your user account with your Apple ID, you can use your Apple ID to reset your login password.

1. Click the question mark  next to the password field.
2. If you don’t see a question mark , press and hold the power button until your Mac shuts down, then press the power button to restart your Mac.
3. Click the arrow  next to “reset it using your Apple ID”.
4. If you don’t see an arrow , see the Apple Support article If you can’t reset your Mac login password.
5. Enter an Apple ID and password, then click Next.
6. Follow the instructions to reset your login password.

If you don’t remember your Apple ID password, see If you forget your Apple ID or password.

Thanks

[Link Edited by Moderator]

You can't.

There is no legitimate way to get through a password login without a password or data loss.