The best investment is to divide your capital into several parts and invest in a private currency that fluctuates and has a good history of price increases, such as Ethereum and Bitcoin Cash, and buys other currencies and the first part of your capital at the same time. And at the same time sell at a slightly higher price in the Limit trading section and do not return to the side of the capital you sold if the price trend of the currency is ascending that you made a profit and if it is a decline, allocate the second part of your capital to the same currency And again, like the first part of the capital, sell at a higher price and continue this process until the price of the currency falls. This strategy will only lose if the currency price only decreases, which of course is a very small number and close to zero digital currency has this feature, but if you implement this strategy on famous currencies that have a long history,  you will definitely make a good profit