Naruto's Ninja Technique

People in the ninja world called him the most perfect ninjutsu master in history, but he dismissed it. Didn't he just create a few S-level ninjutsu? Isn't it just proficiency in all ninjutsu? I casually created a lot of S-level ninjutsu, baskets of Muyin ninjutsu, and A-level ninjutsu and threw them everywhere. Grandpa, do I need that kind of garbage? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.