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In order for one to have a really healthy investment in cryptocurrency specially bitcoins, you really have to be active when it comes to trading. Prices for bitcoins are extremely volatile due to the fact that it's ultra expensive. So play it safe and get even the smallest profits.
He needs to start from the beginning because of the bankrupt, and he doesn't have anything. But if he still has money, then maybe he can start to buy bitcoin or buy the low coin price. I am sure that he can recover his loss, and he can make the profit again in the future but there is a lot of work to do, and the important thing here is he needs to learn about trading so he can be able to make the profit. I agree that he should trade with safe and don't expect the big profit if the situations are not right, it is better to get the smallest profits than never.