New to this and unable to navigate technical terms: Want to understand how it works and future

Basically the title, I am very limited tech knowledge and want to learn more about OCLP. I am still not able to understand (after a couple of videos and post) is the following:

• How does it work in backend (in intuitive terms)? Does it keep old and update OS and picks most stable one? Does it sort of trick the updates into assuming the device is compatible?

• I read a lot of articles that support after Tahoe might not be there due to no support for Intel macs. What becomes a challenge with supporting post that?

Is there any good YT video or guide that you could suggest? Something that explains it in a bit simpler language so that I can dig deeper later.