Bitcoin will be very safe, and will not be stolen by others, as long as we are able to keep the secrecy of our bitcoin wallet password, and keep it well in order not to be lost or stolen by others. I think the best bitcoin storage is through blockchain, because when we will do the transaction required verification of gmail we register in the blockchain.
The best way for storing bitcoin is to have an offline wallet because it is safe from the hackers since the hackers are just virtual and they cannot be able to penetrate or hack and get your bitcoin when you store them on an offline wallet. You can get offline wallet by creating a paper wallet or buying a hardware wallet.