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If we talk about investing in crypto currencies, what is certain is that we talk where the tokens that have long been profitable, it's better to choose a number of options such as Eth, Cardano etc. because the new is not necessarily profitable.
In my opinion in this year 2019 we can consider to invest in ETH because it has started a new year with a good recovery from the crash in December and this recovery will extend until the end of this month
In this 2019 year I would go with top 20 to 30 on the coin market cap because these coins have the potential to fly in this year when the market recover