It is nearly impossible to hack the bitcoin network and steal . The real problem is not everyone understand bitcoins. You will need to find the private key for a particular public address. The possibilities are limitless. The major problem is not everyone understands how bitcoin works which makes them to make choices that exposes them to fraud.
There is a possibility that your bitcoin will be hacked if you give your private key everything in your wallet will be lost for you to keep your private key if I ask bitcoin for hacking difficult because it is a crypto currency .