Fake Email

If you gave out info on your Apple ID, read here: Change your Apple ID password - Apple Support

To protect your Apple ID, read here: Two-factor authentication for Apple ID - Apple Support

Note: make sure you have at least 2 trusted phone numbers.

If it's your credit card, call your bank.

If you mean you entered your details on their site you should change those details.

And if you still have it you could forward the email to Apple : reportphishing@apple.com , and then delete it.