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Are PC Hardware Companies Slowly Driving Technology into Restricted Closed Ecosystems?
(www.scottrlarson.com)
This is a most excellent place for technology news and articles.
Dual boot is a misnomer, you can put as many OSes on a disk as you like
https://www.howtogeek.com/187789/dual-booting-explained-how-you-can-have-multiple-operating-systems-on-your-computer/
And like your link says, you could even run them in virtual machines