1) There is no formal academic education behind the concept (that I'm aware of). If you do a CS major, nobody's going to explain to you the accumulated 15 years of practice and knowledge around the concept.
2) Due to 1), people just repeat what other people tell them. It's like a long game of telephone. It turns out most software development today is just a game of telephone between devs (and now AI). So almost everyone is misinformed.
The Wikipedia page for DevOps is the best generic starting point if you want to know more.
If you want to know more after that, there are a number of books and blog posts. Jez Humble, John Willis, Gene Kim, Patrick Debois, etc are the people to read. It's a much larger body of knowledge than you might think. Almost none of it has to do with devs supporting/running what they write (that's a small subset of a larger category, and there's multiple categories of 'stuff')
The issue with the above names is that they can be applied to a domain or area of practices, or an organizational boundary. In a non-trivial number of organizations, "DevOps" is viewed as a support entity for one or more software development teams, versus software development teams practicing "devops."
This applies to many of the *_Ops names in fashion during the past five years or so.
The biggest improvement that devops brought is that it made managers feel dumb, outdated and scared because they were not "doing devops" while everybody else was, so they kinda started listening to sysadmins and what they had to tell.
Uh, devops engineers did not come out of nowhere. They did not come out of the ground like mushrooms. Most if not all the "devops engineers" i know are just former sysadmins. They were already willing to do whatever devops was supposed to be, it's just they they were largely ignored.
Writing this I just realized that maybe the best way to obtain organizational change is to make management and upper management feel stupid and outdated. Interesting.
Good resource for different types of teams is here: https://web.devopstopologies.com/