How to install macOS Sonoma on an unsupported Mac

Macworld
Apple updates its macOS desktop and laptop operating system once a year, like clockwork, bringing new features and improvements. That’s all very well, but Apple’s most recent version of macOS, Sonoma, won’t run on a Mac mini, MacBook Air or MacBook Pro that launched before 2018, iMac’s from before 2019, or the Mac Pro from before 2019. If your Mac is too old to be supported you are out of luck… Or are you?
What if your Mac or MacBook is older than those me