https://www.gamespot.com/articles/divinity-original-sin-2-crafting-guide-how-to-make/1100-6453845/

Divinity: Original Sin II is complex and dense, with much of its gameplay pillars requiring some trial and error to figure out. Crafting, for example, is tricky to get to grips with, so much so that it can become an underused tool. However, crafting also happens to be incredibly useful, so to help you get comfortable with making cool things we've put together a list of interesting and eclectic recipes for you to use.

In the video above you'll see how to use spell scrolls to create spell books and learn skills permanently. Before long you'll be making enemy grenades explode in their pockets, automatically resurrecting, giving your party stable footing on ice, and much more.