magic exists in certain forms and have a certain set of rules
incantations, which are written, carved or engraved
words of power, when spoken in the correct manner will evoke their properties
Magical Focus, existing in the form of a wand, gemstone, staff, or other inanimate object
Potions, the mixing of ingredients into a soup which is usually, but not always consumed
Sigils and Glyphs, symbols when activated by touch or object sacrifice, evoke powers
Organic compounds or glands, existing in creatures bodies that can expel power, like the fae or dragons
If you want to get stupid technical, if you have the correct materials and know-how, you can ultimately use magic like cheat codes for the source engine of the holographic simulation matrix of this bullshit universe. Yes their are rules to how everything functions, and those rules can be bitchslapped with a whole subset of other rules which basically say "I do what I want"