alt Hacker News> f you want to write good fantasy, it helps a lot to include: Huge exploding fireballs. Cool-looking protagonists mastering the battlefield with confidence and style. World-altering stakes.
Maybe for people that don't subscribe to this, something a bit less... Action-y makes it more interesting.
Something about how you phrased this makes me think you might appreciate Master of Five Magics by Lyndon Hardy. There are five kinds of magic, each with their own unique source, style, and pretty rigorous rule set, and the protagonist sets out to learn them all (unheard of, if not outright forbidden).
https://en.wikipedia.org/wiki/Master_of_the_Five_Magics