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Microsoft wants you to talk to your PC and let AI control it
(www.theverge.com)
This is a most excellent place for technology news and articles.
These are all pretty easy to answer with a search, but here's some info to get you started:
Lots of distros are similar to Windows in many ways. Some are specifically geared towards Windows-to-Linux migrants, or trying to be as close to Windows as possible. They are all much more customisable than Windows too, so you can change it to whatever works for you.
Linux Mint is often recommended to newcomers. Zorin OS is another good option that is more like Windows.
https://www.howtogeek.com/windows-like-linux-distros-you-should-try-out/
No, but compatibility is constantly improving and more developers are natively supporting Linux.
Game compatibility list: https://www.protondb.com/
Also, Windows app compatibility list (though many Linux app alternatives are better than their Windows counterparts IMO): https://appdb.winehq.org/
Windows is far less secure, and targeted by much more malware due to it's market share.
https://linuxsecurity.com/news/security-trends/antivirus-linux
Many Linux users don't bother with antivirus software at all, but yes, there are plenty of options available.
https://www.tecmint.com/best-antivirus-programs-for-linux/