Just like stock, you can invest all your money for a coin code if you really trust. But that would be very dangerous. One can make sure that the coin will not fall down to 0 a day.
The advice is to diversify your portfolio. That will help reduce the risk. You do not earn much but if not lost also much.
Thanks for your advice,but in my own way,of handling my virtual currency, i divided it into three, the first part i invest it into trading investment by finding and buy altcoins with a low price and selling it when the price is high,and second part, i save it into my local exchange wallet and the third part i used it in a long term investment,so that someday if the value of bitcoin will grow to $1million,i will gain a huge profit.