While you are creating an account on Yahoo, then it is necessary to make a strong password, even don’t share it with anyone. If you lost your account password or you want to reset your password due to various reasons, then you have to confirm that you have an alternative email address or phone number. If you don’t have alternative email address, then use phone number. For more, feel free to contact Yahoo customer service.
www.my-accountrecovery.com/yahoo-customer-service/