iCloud password history

If you are locked out of your Apple ID account you can go to https://iforgot.apple.com

This will provide you with the recovery steps you put in place for this situation.

Here are some support articles that should help:

If you forgot your Apple ID password - Apple Support

If you forgot the answers to your Apple ID security questions - Apple Support

If your Apple ID has been locked or disabled – Apple Support

To access a Mac an admin password is always required , you have forgotten Mac admin password and its not accepting the password that is filled , so reset it https://support.apple.com/en-in/HT202860

If you ever had set up iCloud Keychain in Mac https://support.apple.com/en-in/HT204085

What information does iCloud Keychain store?

iCloud Keychain stores credit card numbers and expiration dates—without storing or autofilling the security code—and passwords and usernames, Wi-Fi passwords, Internet accounts, and more. Developers can also update their apps to use keychain, if the app is on a device that uses iOS 7.0.3 or later, or OS X Mavericks 10.9 and later.

How does iCloud Keychain protect my information?

iCloud protects your information with end-to-end encryption, which provides the highest level of data security. Your data is protected with a key that's made from information unique to your device, and combined with your device passcode, which only you know. No one else can access or read this data, either in transit or storage

you can view the Apple ID password that is saved in keychain access see the article https://support.apple.com/en-in/guide/keychain-access/kyca1085/mac