6. Things you don't know what to do with
Before you throw away anything you no longer want, ask yourself, "Could someone else use it?" Consider selling unwanted items at a yard sale or online, or giving them away for free via websites such as Freecycle.org or Craigslist. Donating items to charitable thrift stores often gives you a tax deduction, and there are even specialized charities eager to receive donations of everything from your old saxophone to that bicycle in the garage you haven't ridden since the Reagan administration.