I received an alert from Apple yesterday advising. me that my Apple ID had been compromised. I was directed to my Bank: Citibank. I connected to the Citibank site and was told by Bank security that $35000 had been withdrawn from my account.

See -> If you think your Apple ID has been compromised

If you think your Apple ID has been compromised - Apple Support

To keep your Apple ID account secure, see the following Apple articles: 

Recognize and avoid phishing messages, phony support calls, and other scams

Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support

Phony "tech support" / "ransomware" popups and web pages

Phony "tech support" / "ransomware" popup… - Apple Community

See who has access to your device or accounts

See who has access to your iPhone or iPad – Apple Support (UK)

Delete suspicious content from your devices

Delete suspicious content from your devices – Apple Support (UK)

Check your Apple ID device list to see where you're signed in

Check your Apple ID device list to find where you're signed in - Apple Support

• if you see devices that don't belong to you, delete from your account.

Personal Safety User Guide -> Personal Safety User Guide – Apple Support (UK)

Manage and use your Apple ID -> Manage and use your Apple ID – Apple Support (UK)

(if you haven't already done this) Two-factor authentication for Apple ID -> Two-factor authentication for Apple ID - Apple Support

Change your Apple ID password -> Change your Apple ID password - Apple Support

• Create a strong password for your Apple ID, It is best if your password consists of eight or more characters and include upper and lowercase letters, and at least one number. You can also add extra characters and punctuation marks to make your password even stronger. 
• Never provide your password, passcode, security questions, verification codes, recovery key or any other account security details to anyone else. Apple will never ask you for this information.

Then see this Apple article: What to do after you change your Apple ID or password

What to do after you change your Apple ID or password - Apple Support

Never jailbroken your iPhone.

Apple does not send alerts like this, not in email, not a phone call, not in text. You got a scam, phishing email.

Did you use a link or phone number within the email to contact your bank? If yes, that wasn't your bank and was a scam, too.

Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support

I’m reading terrible info that others have had their money stolen from banks. I’m so angry this can happen. I never open any email or alert for this reason