@golden_apricot idk if you're being serious or not but I'll answer truthfully.

Window defender, an updated web browser/os and my brain. You shouldn't get a virus as long as you aren't being a dumbass these days. Windows defender is one of the better anti virus programs out there at this point and web browsers, good ones at least, have built in protections against certain things like insecure connections, untrusted websites, notifications regarding websites with SSL enabled. And really if you aren't clicking every sketchy link you see you'll be fine