my friend got hacked yesterday
Well, thing is, you have your own bank (unless you use online wallets, which I suggest you don't), so you have a control of your own security. This means that it can potentially be very safe, but if you're not careful you aren't safe at all.
Well, nothing is completely safe
His friend was probably using blockchain, and a hacker hacked him for some reason.
But seriously, make a paper wallet, hide it inside your bank, that's as safe as it gets :/