I don't know about the best (because I started back in the 80s with a commodore 64, not exactly repeatable) but a good way is this guy: https://eater.net/6502
The keyword is consistent. Some settings have magic as inherently chaotic and difficult to control.
A good rule of thumb is that if a fantasy setting has a school for magic, it's probably a science. If it's knowledge passed from master to magically gifted student, it's probably not very consistent.
Just to make sure my understanding was accurate, I asked Gemini to critique my explanation:
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Unless it’s lying to me about itself, I was able to explain the basics of it in two relatively simple sentences. Of course that doesn’t cover everything, but Gemini thinks that’s a pretty good overview. After expanding on each point in its reply, it said this:
I think a lot of the confusion over these models stems from hype and marketing that makes them out to be more than what they are.