Just come it to my mind. is it possible? to get hook into your wallet and send some to another wallet? 
can , so don't save all your bitcoin in one wallet and be carefullyWell I suggest you choose the wallet that is very secured. And avoid sharing your earnings online to prevent other from thinking to hack your account. I think it is very safe to keep your bitcoins from your desktop wallet rather than online to lessen the risk of hacking your bitcoin.