Airline fees

You’re paying extra for almost everything when you fly these days, from your bags to your seat. So be sure to compare not only the prices of flights but what they’re charging in extra fees. You may also want to weigh your bag before you go to avoid any additional charges.
Discover 12 ways to make flying economy feel like first class.
Bank fees

Not keeping enough money in your bank account could cost you some serious cash. How much? ATM and other maintenance fees can also add up to $1,000 over ten years. To avoid them, look for banks with free ATMs that don’t charge monthly maintenance fees.
Buying things new

Sure, a shiny new car is tempting. But as soon as you drive it off the lot, the car loses 11 percent of its value. A better option? Opt for a reliable used car and a short-term loan you can pay off quickly. The same goes for electronics and other items.