2. Taking marginal trades
Marginal trades are trades that technically may be profitable, but only just. The expected profit will be small and will probably be wiped out by sloppy execution. You are most likely to take these trades out of boredom when markets are quiet and there aren’t any good opportunities. The problem is that they will consume your attention and energy, and you’re likely to miss better opportunities when they come.
To avoid marginal trades, you can try to find something else to occupy your time when markets are just too quiet. Alternatively, you can set a minimum expectancy that you will accept for a trade. Focussing on improving your trading stats will also make you think twice about taking trades with low expectancy.