There are no spells, instead since it's all skills based, you have Magic Skills as a category to choose from during character creation and when you level up (things like pyromancy, blood magic, shadow magic etc). So those skills work just like any other skill check in the system; you decide what skill you're using and how you're using it, then make a check for degree of success.
There are also player Abilities that function as basically shortcuts that don't require skill checks, and you get to make your own for your character. So if you want to create shortcut spells that just work, you can do that in exchange for spending a resource. I made the magic system and abilities specifically around the idea of "i have a category of magic i can use, but I decide how I use it," so if you want flexibility in your decisions, you'll enjoy the magic system.