You are going to lose more often than you win. So regular losses are no big deal; they are to be expected. But what should you do after a BIG loss; a loss where you lose a lot of money? Here is the basic strategy:
After a major loss, do not overreact.
Wait a few days to objectively determine what went wrong and what you should do in the future to prevent that big loss from ever happening again.
The reason why you should wait a few days is because you will not be “thinking straight” right after the loss. You will be too emotional and maybe even a little depressed. You will need a few days to be able to think about the event logically and objectively.
As they say, hindsight is 20/20.