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I want to make it clear beforehand that capital is priority number 3...
the first priority that you must have is the skill/basic knowledge about trading and the second is the mentality that must be prepared with the possibility of loss that will occur in the future. if you already have the thing I mentioned, with capital only $ 20 you can make a big profit.
I do agree about the priority but I don't think that is enough to give you a profit.
Even professional investors or traders can lose, what they can do is just lessen the risk they are taking but then again, skill/knowledge and strong mentality can't always mean a big profit. Loss is inevitable in trading especially if you will be taking the market of cryptocurrencies that is so volatile and unpredictable.
I agree that it is not possible to enter a large turnover of large exchanges without losses.