I re-learned an expensive lesson last week.

Regularly reviewing credit card statements and other financial accounts is a good habit to develop. If I followed my own advice, I would not be out $70.

I sold my home in June, but forgot to cancel the home warranty until July. Had I been reviewing my statements, I would have thought about the automatic debit sooner and canceled the home warranty on time.

I first learned this lesson right out of college when a restaurant double charged me for dinner. It was a simple fix, but if I had not been reviewing my debit card transactions, I would have never noticed the error.

What financial lesson have you re-learned?