Credit

Establishing credit is a good practice. However, living on credit is an unwise practice.
When we married 30 years ago, we made a commitment to NOT live on credit. Although we own a credit card, we treat the use of our credit card like a paper check or a debit card. Upon using the credit card, we record the transaction in our account as if we had written a check or used our debit card. Then when we receive the credit card bill we write a check out for the entire amount of the bill, yet do not have to deduct any funds from our records because we have done so all along.
We never have to worry that we don't have the funds to pay our credit card bill, never have to pay interest or late fees.
We've established good credit by showing we can be responsible with our money and with the money of others.