The single worst and widespread mistake out there is Buy and Hold. Buy and hold is a thing of the past. Buy and hold isn't a strategy, it gives you a false sense of security. When you buy and hold you think "my work here is done", it's an excuse to be lazy. It needs to be "Buy and Homework". Listen in on conference calls. Check for Management confidence. You should be spending at least an hour a week studying, per stock.

If you don't have the time their are some great programs, books and systems that help you with your homework. I have listed some of my favorites at the end.

If only I bought this or that. Don't dwell on missed opportunities or bad mistakes. When you can't get over your mistakes it becomes counter productive. Being an Investor is emotionally brutal. You have to be tough minded. Focus your time on making good decisions in the present. Learn from your past then move on. It is our nature to regret mistakes, but overdoing it won't get you anywhere. Don't let it throw you off your game. This is what really separates the good investors from the bad.

You can get great stock tips. These are the ones from insiders who actually know a company's future moves. These types of tips are illegal. The other types of tips are usually from someone who has an agenda. If someone wants to give you a stock tip it should send up a red flag. That being said there is a difference between a "stock tip" and a company or newsletter that does the homework for you and gives you recommendations.

Diversify. Diversify. Diversify. Don't keep all of your portfolio in one sector. You should not have more than 20%, even in a very hot sector. Remember the tech bubble. Enough said.

Sometimes you are your own worst enemy. In these times you need rules to suppress your instincts. Arrogance is a sin that will cost you a lot of money. Buying your whole position in a stock at one time is the most arrogant thing one can do. When you buy your whole position at once you are saying "this stock is not going any lower from this point on." That is arrogance. Build a position over time, not all at once. Patiently wait for good entry points. It's hard to time stock perfectly...Yet another reason to buy slowly.

Investing in the market takes a lot of time and discipline. Following these rules will save you a bunch of money.  It's important to do your homework and have the right tools.  There are many systems and programs to choose from.  I've found a few that are inexpensive, guaranteed, and very successful. Check them out for yourself. Click Here!

Good Luck and Good Investing!