There are a few ways to introduce a magic system.

a) Don't explain it. Let readers learn with the character. (ex. there was only one person who ever understood the magic of ____.) Eventually, your character meets this person, whether it was a hard journey to meet them, or if it was an easy part. b) Have an unknown ancient "something" explain it, possibly in some story that somehow pertains to your main character. (ex. There was a prophecy of ____ needing to learn the magic system of _____ to save the world. The magic system is very complicated indeed and ___ will have to work hard. The specific prophecy is ______ and I, as the only one knowing how the system works, will tell you now. It works as _____.). c) Maybe introduce some artifact that explains it. (ex. No one, in the stars or on the ground knew how magic worked! But way, way back, someone knew, and wrote a book on it. This book was hidden ____, and in order to win the war, _____ must find it; or all is lost.) d)Have evil explain it as a joke. (ex. Have the antag explain it to the protag in a final battle, as if to say that the protag will never win! But nay, the protag wins anyway, through unlocking magic through emotion or something like that.)

Anyways, good luck!!! Introducing magic really is complicated........

There are a few ways to introduce a magic system.

1. Don't explain it. Let readers learn with the character. (ex. there was only one person who ever understood the magic of ____.) Eventually, your character meets this person, whether it was a hard journey to meet them, or if it was an easy part.
2. Have an unknown ancient "something" explain it, possibly in some story that somehow pertains to your main character. (ex. There was a prophecy of ____ needing to learn the magic system of _____ to save the world. The magic system is very complicated indeed and ___ will have to work hard. The specific prophecy is ______ and I, as the only one knowing how the system works, will tell you now. It works as _____.).
3. Maybe introduce some artifact that explains it. (ex. No one, in the stars or on the ground knew how magic worked! But way, way back, someone knew, and wrote a book on it. This book was hidden ____, and in order to win the war, _____ must find it; or all is lost.)
4. Have evil explain it as a joke. (ex. Have the antag explain it to the protag in a final battle, as if to say that the protag will never win! But nay, the protag wins anyway, through unlocking magic through emotion or something like that.)

Anyways, good luck! Introducing magic really is complicated...