as with anything valuable, hackers, thieves, and scammers will all be after your bitcoins, so securing your bitcoins is necessary.
I recommend using Bitcoin wallets that were built with security in mind:
Ledger Nano S Ledger is a Bitcoin security company that offers a wide range of secure Bitcoin storage devices. I currently see the Ledger Nano S as Ledgers most secure wallet.
TREZOR TREZOR is a hardware wallet that was built to secure bitcoins. It generates your Bitcoin private keys offline
Bitcoins should only be kept in wallets that you control.
Because Bitcoin is on the internet, they are even easier to steal and much harder to return and trace. Bitcoin itself is secure, but bitcoins are only as secure as the wallet storing them.