Hello, please help me I forgot my Note password and it contains important information

Click on this link to read 'How to lock notes on your iPhone, iPad, and iPod touch' --> How to lock or unlock notes on your iPhone or iPad - Apple Support

Reset your notes password if you forgot it

To unlock a note, you need to enter the password that it's locked with. If you forgot your notes password, Apple can't help you regain access to your locked notes. You can create a new notes password or use your device passcode instead, but this won’t give you access to your old notes. If you set a new notes password or switch to your device passcode, you can protect any notes that you create going forward with the new password.

If you have multiple notes passwords, you won't be able to tell which password you should use when you look at your Notes list. When you open a note locked by an old notes password but you enter your current password, you'll see an alert that you entered the wrong password with a hint for your old password. If you enter the correct old password, you get the option to update that note's password to your current one.

Beginning in iOS 16, you have two options to lock your notes. You can lock notes with your iPhone passcode. Or, you can create a unique password only for Notes.

If you use your iPhone passcode, you don't have to create and remember a separate password. If you access your iCloud notes on more than one Apple device, use the passcode or login password for that device to unlock those notes.

If you use a unique password for Notes, there is no way to access your locked notes if you forget the password. If you forget this password, you can reset your notes password and use your new password to lock other notes. If you access your iCloud notes on more than one Apple device, use the same notes password to lock and unlock all of them.