Never let a profitable trade turn into a loss, and never let an initial trading positions turn into a long-term one because it is at a loss.
Don't buy a stock simply because it has had a big decline from its high and is now a "better value", wait for the market to recognize "value" first.
Don't average trading losses, meaning don't put good money after bad. adding to a losing position will lead to ruin.ask the noble laureates of long-term capital management.
As long as a stock is acting right and the market is in gear,don't be in hurry to take a profit on the whole position.scale out instead.
The stock market is never obvious. it is designed to fool most of the people,most of the time.
Play the market only when all factors are in your favor. no person can play the market all the time and win.there are times when you should be completely out of the market,for emotional as well as economic reasons.
"It's not the ones that you sell that keep going up that matters.It's the one that you do not sell that keeps going down that does"