How to Get and Use the Skill Book
Obtaining the Skill Book
The Skill Book is a registry item in the mod. It is the entry point for the skill system, so get one before you worry about individual skills. Check your crafting options with the materials you already have on hand; the Skill Book is a shaped craft, meaning the layout of ingredients in the grid matters.
Using skills
Once you have a Skill Book, it is the item you interact with to manage your skills. Open it to see what you can assign. Skills are tied to your equipped weapon, so the weapon class you are holding determines which skills are relevant. A Dagger, Longsword, Greatsword, Spear, and Tachi each play differently, and the Bokken, Uchigatana, and Glove have their own feel.
Equip the weapon you intend to use, then open the Skill Book and assign skills to it. In combat, trigger the assigned skill while that weapon is in hand.
Removing skills
If you want to clear a skill, reopen the Skill Book and remove the assignment from the slot. This frees the slot so you can put a different skill there. You do not need to craft a new Skill Book to change your setup; the same book manages all of your assignments. Keep the Skill Book in your inventory so you can adjust skills between fights.