What is the most common investors mistake?

I'm a novice investor and I would like to know your opinion or maybe some experience.

 

Looking for good advice on ET.

 

Live and Learn (that's your best teacher)
You'll realize them all on your own quickly -- if you trade with real money.

 

More specifically I wondering about investing to the energy sector. But I do not want to make a mistake. It falls for a long time. Maybe it's time to buy? Sooner or later it is must stop falling. What do you think? Is it the moment when you need to buy the dip?

 

An old turkey farmer friend of mine used to say, "live and learn... mostly just live."

 

Investing in things they don't understand....

 

You cannot learn anything about trading looking at Message boards. These forums are for entertainment, not enlightenment. You may occasionally find a useful post but it is like a needle in a haystack. Signal to noise raise is microscopic here. You have to trade and observe to learn, real money trading, not paper trading.

 

it's the same common mistake that the wannabe traders have: operating without a proven method and not realizing that they do not know what they are doing

 

Cutting your losses (or more specifically, WHERE to cut your loss) is the one and only rule of the markets.

 

Letting losses run.