Cryptocurrency is safe, and what makes it so is the ability for addresses to change after very transaction, and also you are able to store you balance offline on a hardware wallet to avoid the online ones, online wallets have a 2FA which sends you a verification SMS containing a password each time you or somone logs in from a different IP to your wallet, and if you are keeping your crypto offline than the only way a person could hack you is by sending a virus or a keyloger to your computer.