Help Required to Create validation Rule

Need Help on the below assessment to create the validation rule, I tried but ....😥😥 

Need some explanation to get the understanding on this:

Create a Validation Rule

Create a validation rule that displays an error message and prevents a user from creating or updating a contact if two conditions are both true.

• Create a validation rule:
  • Rule Name: Contact_must_be_in_Account_ZIP_Code
  • Operator: AND (return true if both conditions are true)
  • Define two error conditions:
    • The contact is associated with an account id Hint: Use the ISBLANK and NOT functions.
    • The contact mailing zip code is different than the account shipping zip code Hint: Use the API names (MailingPostalCode and ShippingPostalCode) and the <> (Not Equal) operator.
  • Enter an error message for the validation rule