Of course, it is very important, crime in cyberspace is very high, and the most disadvantaged is us if we underestimate internet security... I once lost important data because I was not confident with the security of my device and network, from that I learned to care about security, so that my wallet was safe...
Wallet stores our most precious coins and if wallet is not save and hacked, we are left with nothing. This means that we should first make all the efforts to secure our wallet as rest of the things depends on how secure and safe our coins are.
Yeah right, In my opinion, we should use the Offline wallet as Electrum or Trezor, it's safer because
our own control. Don't use Wallet Exchanger to keep assets, because It's can easy to hacked.