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Very correct words. You need to understand what you are investing in and be interested in it. Most investors who lost money did not even understand what they were investing in!
New people always come to the market. They have no experience and understanding of what trading and investment are. And it always will be. Therefore, for scammers and wheeler-dealers there will always be work in the market

Unfortunately, most people learn only from their personal mistakes. But all the same, as in any other business, you need to work hard and look for good projects, and then you will have a profit.