Hesitation
Seeing a valid setup and failing to pull the trigger. Often followed by chasing when the move runs without you.
Usually a symptom of recent losses or inadequate backtesting - you don't fully trust the system. Fix with reps on demo until the setup is muscle memory, and with a trading plan that makes execution mechanical.
Learn to actually use Hesitation.
Definitions are the easy part. The free first five modules put this on a real chart and make you do the work. No card required.