I got a pretty good idea! But I think I forgot some of it.
Like there should be somethings that you can learn techniques by buying something and you have to take training. Then when you complete it and when you use your sword you can do somethings to change the s+back attacks. Like you got like 3 techniques. Backflip stab, Boomerang Sword, EarthShake. Then if you equip it if you hit like a button you can change what technique to use.