Jutsu Styles are the bread and butter when it comes to aspect permissions and understanding what a character can and cant do based on their abilities.
Styles cover everything related to advanaced skill. Every shinobi is going to be good at something and this is where it begins to show.
Cost: Every Jutsu Style costs 1 Fate Point or 1 Point of Refresh.
Justu Style Permissions: Just because you purchase a style aspect doesn't mean you necessarily need to have stunts to follow up. Every Jutsu Style should have basic permissions that give players and GMs a simple understanding of what exactly this style should be able to do at its lowest level. The permissions that you find on the SRD are just a simple idea and dont mean thats all the style is capable of. Talk it over with your group and decide what the baseline abilities should be.
Stunts: Purchasing Stunts related to Jutsu Styles is the only way to get numerical and true mechanical value for your Justu Style Aspects. Its important to decide what a character will focus on.