It is not at all try not to give your private key to anyone because into this era no one is trust worthy enough to share your earning with,. You will have to remain so careful after investing into crypto currency, while you invest try to buy max amount of bitcoin at low price then hold it for long term and to hold it safely you will need a wallet like blockchain and it will give you a private key that you will not have to share with anyone for staying safe from hacking.