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Microsoft really wants Local accounts gone after it erases its guide on how to create them
(www.xda-developers.com)
This is a most excellent place for technology news and articles.
Awesome! Linux Mint's welcome page should have given you directions to setting up the built in firewall. If you really want an antivirus, ClamAV is a good one for Linux. However, whether you need one on Linux is actually a complicated question: https://forums.linuxmint.com/viewtopic.php?t=358408
Really depends on your use case, at the end of the day. Good luck, and let us know if you have any questions!