That's why the importance of a skill and knowledge in investing,
when we don't have these two things I think we will very easily lose money,
everyone who wants to start investing and wants to make a profit needs to learn and understand it, of course it's not an easy thing
Not at all!

If does do you think there are still many people will lose their money in this business? Proper understanding and right sets of skills are learnable in each participation that you made during your stay. Even you lose some money in placing your investment on a wrong project, there's still knowledge that you can get to avoid making the same mistake over and over.
Trader who know how to adjust and how to deal with any kind of results mostly succeed from this venue of investment. You are the one who will lead your own fate, make sure to keep your goal intact and not to fall into greed.