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...
This is a very common question. I think that for better wallet protection you shouldn't visit any sites that can harm your computer, and create new e-mail exactly for your wallet. And don't tell anybody what are you doing and how much money did you earn by trading.