I could explain to you SQL injection or a rainbow table, but in practice, I don't know how to keep my own PC safe (eg. when browsing on public WiFi). What configuration do you use to keep your computer secure?<p>1. What antivirus do you use?<p>2. Do you use a VPN? A personal one or a service?<p>3. What Firefox/Chrome plugins do you use? (eg. HTTPS Everywhere)<p>4. Do you use a program to store passwords?<p>5. What do you use for backups?<p>6. What other tricks do you have?