It's crystal clear why people lose money in trading, and it's because of lack of knowledge, and they actually don't know that in trading, you get only what you deserve, if you are good in the craft, you will definitely be profitable, but if you are not or you have no knowledge about it, you will be getting liquidated time without numbers.
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it's true that most of those who lose on trading are those who trade with the wrong mindset, where they enter the market without good knowledge and they play with high leverage. they think that trading is very easy and anytime they can make money from it, but unfortunately what happens is that their trading plan is wrong and in the end they lose big from it.
It's also not about the knowledge but mostly the experience necessary for trading. Because the market is not always how it was portrayed in a course or a book. Most of the time you cannot understand it. So you need experience. You need to encounter different market sentiments in different market seasonality. If you do have the experience, then you have an advantage. If you don't have the experience d then can't you be profitable? No. If your system happens to be profitable in the right market condition, then you can make more money at least play at break even as a beginner.
When you are just starting, you cannot simply expect yourself to be making more amount of money. You just need experience and build right mindset along with it.