Avoid ending up like a friend, who used all the money he has to invest in bitcoin and also took a loan, promising the lender that he will pay back when he gets paid in a month, after a month he never received the salary, I warned him doing this, because he has no doubt mixed investment with 'whatever it takes', is it safe to call this greed? I don't know.
Now he wants me to lend him some money to at least pay the loaner back and later settle me, there is more, now I have to send him some money to buy some food.
There isn't anything wrong in lending a hand to a friend every now and then. The main idea for me is that, you get to do only that which you would be comfortable doing, that which would bring you peace and some satisfaction other than, going out of your way then start regretting your actions.
Your friend probably never learned anything as, its always said you have to invest with what you can afford to lose. Clearly, loans aren't that and worst of all, it comes at a price #Interest.
How do one gets so sure over something that isn't within your control? It just gets shocking how they just come in and feel its all profit. If that was the case, you won't find people trying other trades, bitcoin would have surely been more of a trend than it is now if it cae without any risk.
Understanding the risk comes as a directive on how to place your funds. Your friend @OP needs to take things easy on himself and do more analysis on how to manage his finances to accommodate his needs, wants and excesses.