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If you’re using Windows, the built in AV (Windows Defender) is actually pretty great. Maybe run Malware Bytes every now and then, (as in, install Malware Bytes, run it, then immediately uninstall it again). Between those two (and healthy browsing habits, like using an adblocker, not downloading random .exes, etc) will keep you protected. No AV in the world will be able to fully defend against bad browsing habits, so it all really comes down to that.
But this is Lemmy, so you’re bound to get buried in “just switch to Linux cuz Windows is a virus” stuff. And while that may be true, it’s clearly not the answer to your question.
Yeah, 6” is basically a kitchen knife. I carry a fairly large pocket knife by most standards, (a Smith & Wesson Black Ops 3) but it’s only 3.25 inches long. That 6” blade (plus the hilt) isn’t something you’re going to be able to fit into your pocket, and I certainly wouldn’t consider carrying one around on a day-to-day basis. It’s fine as a novelty letter opener, but it should stay at your desk.