Regardless of what type of assets you own, storing them in a safe place can often be a problematic situation.
When you are speaking of cryptocurrencies, the environment in which is stored is digital.
Blockchain is a very secure network, thanks to the way it is designed to operate!
There have been many instances of BTC theft and wallets getting hacked. It is important to understand that even though the network is secure, if the security of the individual wallets is compromised, so is the safety of the cryptocurrencies.