1. Overspend it.
Overspending money leads to debt. Debt leads to further debt. Overspending means the inability to get large loans when needed, such as to buy a home or a vehicle. Debt caused by overspending is the worst kind because it is generally a pattern and will continue, meaning you will continue to overspend, and thus get further into debt, rather than out of it. At the very best you will stay even. It is natural to want to spend, especially since it can be quite gratifying, however, it is far more gratifying to be able to spend without burdening yourself later with high interest, bills you can't pay, etc. So, create a budget for yourself and be sure that you work to quickly pay off debts, and set limitations on yourself so as not to incur more debts. Curbing your spending is one of the best things you can learn to do financially as it will not help you once or twice, but your whole financial life.

2. Use credit because you don't have it.
Credit is a wonderful tool, that when used properly, allows you to better your situation, and help you modestly move forward in life even if you don't currently have the money to do it. For example, you use credit in order to get into a home. It usually takes 30 years to pay off a home loan, without this credit, you would not be able to buy a home very easily, if ever. So, while credit for some things is very positive, credit in general should be avoided. It is especially important to avoid using credit as a crutch to make ends meet because you do not have money. For example, if you are buying your groceries on your credit card because you do not have the cash to buy them outright, you are in trouble. Using credit as a crutch leads to high interest debt, and little to show for it. If you find yourself using credit for simple purchases, and being unable to pay the purchase back to your credit card company immediately, you are likely in a downward spiral for money management.

3. Invest it in things you are unfamiliar with.
Investments are great for building wealth, and are often the only way people are going to gain wealth, as there are not enough hours in the day, or energies in a single person to earn enough without investing. However, with investing your money, you have to be familiar with the items you are investing in. Investing in things you know nothing about, or with someone because of a HOT tip, you are asking for trouble. Would you ask a farmer for advice on jewelry, or a jeweler for advice on real estate? No, so don't do that with your investments. Work with experts in their respective industries, and educate yourself as well.