#1: Trading based on emotion. This means FOMO buying, letting losses run because I didn't want to take a loss, and things like that.

#2: Using TA to reinforce my own bias (especially when I was already holding a losing position) rather than trying to use it objectively. In other words: seeing what I wanted to see.

#3: Trying to predict market movements rather than react to them. The truth is that markets are quite unpredictable. Consistent profitability comes from recognizing technical events (like breakouts and failures) and reacting to them, not prophesying future events.