If you are trading the major market indices and you make a mistake. Own it. Admit that you are wrong.
Move on.
NEVER be bullheaded and take a small day's loss and turn it into a big loss over time.
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So you're trading your IRA on the major market and you are on a long winning streak and you get overconfident and you mess up and finally make a losing trade.
What do you do then?
You take the loss. You own it and move on. Get back on track again.