Keep an anti-virus software installed and up to date on your devices. I cannot stress this enough! With all the harmful things on the internet including but not limited to trojans, ransomware, malware, spyware, worms, and other viri its cheaper to pay yearly for a good anti-virus than to risk being locked out of your own device forever or exposing your personal information to the world. I personally use and recommend Bitdefender Total Security. You can find it in our downloads section and FAQs.