There are ten typical blunders that can slowly erode your wealth over time if you aren't careful. These errors involve putting off investments, failing to diversify, investing without a clear strategy, trying to time the market or follow fads, neglecting to do your homework, overlooking fees, basing decisions on historical results, and exiting positions at the wrong time. By checking your portfolio on a consistent basis, you can keep your financial goals on target and steer clear of expensive pitfalls.