Avoid Non-Microsoft Antivirus Software
I also want to raise an alarm about a current AV practice, not mentioned in the article:    AV products like Bitdefender will MITM
    your HTTPS connections by installing their
    own root certificates, by default and 
    without warnings

In the name of "security", this undermines the very purpose of what HTTPS is about, knowingly endangering their users.And consider that I, a highly technical and security conscious software developer, only noticed it because I saw green icons appearing in my search results and then noticed that Google's SSL certificate is now a fake. And I only noticed it because I know how this shit works and those green icons seemed suspicious.And yes, I'm using the word "fake", because I doubt that companies like Bitdefender have to pass the same certifications as a certificate authority or that they have any deals whatsoever with Google. And it's a serious vulnerability, because their certificate can get stolen and used by malicious software, not to mention you now have to trust a third-party with all of your secure connections, which includes your Google searches exposing your most secret desires, your Facebook and Slack chats, your bank account, everything. A third-party that does not have the scrutiny of your open-source web browser.That's just preposterous and these products only survive because users are gullible and technically illiterate.