Cryptocurrencies can be kept online or offline. If the cryptos are kept on the exchange platforms or other online platforms, it can be lost due to hacks.
So it is important to choose the best wallets that are safe and secure. Please help me in choosing the safest cryptocurrency wallets
Everything comes back to you, if it is in the form of a website choose one that offers two-factor authentication (2FA) at least reducing malware attacks or hacking by other people.