Its no longer news that an ICO in Japan has lost over $400 million to hackers. They promised to pay back investors who invested in their ICO. Thsi is a huge loss. After I read that news, I began to wonder. How safe is Bitcoin and Other altcoins? What measures should we take to avoid being hacked ?
Aside from keeping your private keys in a place where you are the only who knows where it is and secured, I think this question doesn't make any sense, i mean they are hackers, you don't when they are going to attack and no matter how strong is your security they are going to find that one weakness that your program has and that's it, the next thing you knew you was hacked by someone.
No one wants his cryptocurrencies to be hacked by those hackers out there, and hackers won't even announce that they are going to hack you, that is weird. So, there is no such thing as "secured" but there is a thing called "precautions".