I'm using different virtual wallet but I find electrum the best wallet for me due to its simplicity. To ensure that your wallet will not be hack, avoid downloading applications from unknown sources, or might as well don't download at all. Depending on how important the bitcoin in your wallet, but it's suggested that you have a dedicated PC for your stuff, since it's online, you might forget that were able click a phishing link or anything that could steal your password, or could monitor your PC, avoid that as much as possible.