You probably understand the rest of what you need to understand CORS. I've noticed that web developers today don't even understand things like HTTP in general particularly well. They're not trying to understand, they're trying to ship the next feature, and CORS is "blocking them".
Sadly true, I love to ask webdevs in intervews if they can give definitions of http, or idk, user agent, and it's impressive how much ignorance there is out there.
