Well, there are actually three ways to lose money: 1) Direct loss (eg. getting stopped out, etc) 2) Opportunity loss (NVDA vs QXO) (also getting out of the trade too early!) 3) Inflation (bet you never heard that one before!)
As it relates to trading of the kind that Padu is engaged in, I would think that the two principal ways to lose money are poor entry timing and bad risk management. Context.
Only one way to lose money Buy price >= Sell price. You can tell 1 million stories justifying your loss. But the trade is a loser because of this inequality.
But then again, Padu never really shows his entries and exits, so it's hard to judge. However, everyone here is too damn gullible to believe everything Padu says at face value, and just assumes he's a losing trader. You're merely playing into Padu's hands and wasting your time (especially you, @Georgii).