Overtrading is a typical rule break. The temptation is strong: The market moves and you see 'opportunities' everywhere. Before you realise it, you have made 15 trades instead of your planned 3.
Why is overtrading so dangerous? Every trade costs fees (spread, commission). The more trades, the higher the 'tax' on your account. More importantly, the quality of your decisions falls with every additional trade.
The 3-trade rule: Plan a maximum of 3 trades per day. If all 3 are losses, end the day. If 2 out of 3 are wins, end the day. The idea: Protect your capital and mental energy.
Of course, '3' is not a magic number. For some traders it is 5; for scalpers, perhaps 10. The point is to set a limit before the trading day starts, rather than during it when emotions are involved.
TradeMentorX automatically tracks your trading frequency and marks days when you trade well above your own normal level. This lets you see clearly whether your results on those days are worse than on other days.