Spend less than you earn. There isn't a millionaire on the planet who got that way by spending all the money they made. That means living below your means. It doesn't have to be far below your means, say Certified Financial Planner practitioners, but it does mean not spending every penny you earn. Take housing, for example.
People often buy the maximum amount of home they can afford.
One trick is to design and follow a spending plan, or budget, so your money goes exactly where you want it to. An example of a simple budget in on my Website. Another key is to spend wisely. Too many consumers can't wait to spend. This particularly applies to credit-card debt.