From my experience, here are 4 reasons I discovered:
1/ Lack of Discipline— a) Not sticking to one strategy, b) not respecting your trading rules, c) not sticking to your plan.
2/ Lack of knowledge—Inadequate understanding of the market, trading strategy, financial instruments, and fundamentals can lead to poor decision-making.
3/ Not having a mechanical trading system—This leads to emotional trading. Decisions driven by emotions like fear and greed rather than rational analysis result in significant losses.
4/ Overtrading—Taking many trades will affect your decision-making ability and lead to poor decisions.
If there are other reasons why traders lose money, share them with me.
Even though all of those are true. But even some of the experienced traders out there are still going to have a bad day even though they don't have all of those. I don't think you can completely free from losses even though you "master" the technique from fundamentals and advanced stuff, you can still get thrown away by unexpected events thanks to the nature of cryptocurrency. Just do your best.
Yes, you are very much correct on this, even though you are a master in trading, you will definitely encounter some losses at some point, but that doesn't change the fact that you actually knows the craft, just that some event in the market will just happen which you as a trader has no control of, something like news, so in such a situation the best is to just raise your head high in confidence because it was out of your control.
And as for most of the reasons traders loses money that the op of this thread wrote down, I think they aren't complete without knowing how to control your emotions, if you have all what the op wrote down and you don't know how to control your emotions like fear and greed, you will still loss money, so emotional control is very much of a key when trading, just as every other components listed down.
Lastly, another component that I believe that makes most traders lose money is over leveraging, most traders don't actually knows how dangerous over leverage is, and that is one of the major reason they lose money, they forget to understand that, in the concept of trading, if you can make a whole lot of money very fast, you can also lose a whole lot of money very fast either, so over leverage should be avoided in other not to lose money in trading.