Lesson One: Jutsu Information.
There are three types of Jutsu, which are called Genjutsu, Ninjutsu, and Taijutsu. Ninjutsu has two sub-categories: sealing and cursed seal jutsu. Each are used to create seals for many and never ending purposes. Also falling into the Jutsu categories is the bloodline obtained Kekkei Genkai.
Every jutsu is put into a power/grade system. 'E' is the lowest, and 'S' is the highest. Most S-leveled Jutsu is used by only the strongest ninja unless they are passed down to their students. This is an extremly rare occasion.
Jutsu's power is based on your overall skill with that Jutsu. If you are good with it, then it's power is increased over time. Pretty much, it is like practicing.
( The rest of this lesson will be continued tomorrow. I also know that everyone already knows this, but I thought I'd teach this anyway until I can think of something else to teach. Besides, best to go over the basics, right? )