People can dual boot Windows computers for a long time, including with Linux and Windows. However, Mac users don't know they can do the same with having multiple macOS systems running on the same Mac computer. The process is simple.
https://support.apple.com/en-gb/118282#:~:text=This%20%E2%80%9Cdual%20boot%E2%80%9D%20setup%20is,an%20earlier%20macOS%20after%20upgrading.
Dual booting macOS and Windows on Intel-based Macs is also simple. Macs with the newer Apple Silicon chip, this ability is no longer possible without using virtualization.
https://support.apple.com/hr-hr/guide/bootcamp-assistant/bcmp173b3bf2/mac
