Again we saw an exchange got hacked. There would be nothing to hack there if people didn't keep their coins on exchanges! For the love of Dog (lol), don't keep your coins on exchanges, start practicing safety, this is your investment we are talking about!
The best thing to do is to keep your coins in hardware wallets. I am sure that it is safest place for keeping your money untouched. But even such wallets can have security problems as I have known recently.