Final answer:
It is recommended to use a debit card when going to a cash-only restaurant because it is directly tied to your bank account.
Step-by-step explanation:
When going to a cash-only restaurant, it is advisable to use a debit card rather than a credit card. One reason for this is that a debit card is directly tied to your bank account, so you can only spend the money that you have in your account. On the other hand, using a credit card would result in a short-term loan from the credit card company, which you would need to repay later.