Chakra
Ninjutsu
Genjutsu
Taijutsu
Speed
Will
Chakra - A form of energy created inside a person's body. This energy allows a person to perform jutsus. Chakra is basically also what keeps you alive. The more chakra a person has, the stronger they'll be and last in a fight.
Ninjutsu - The power of ninja arts. This is the most common type of fighting but also uses the most chakra. There are several versions of ninjutsu techniques from the ones that do little damage to healing techniques.
Genjutsu - The power of illusions. Whenever a genjutsu is cast upon someone, they will have mental pain upon them. There are several ways to dispel a genjutsu. The first possibility is to form a tiger seal and release it directly. One other way is by having yourself or the caster injured physically. Another way is by directing as much chakra to your head. If all else fails, you will need someone to transport their own chakra to you.
Taijutsu - The power of physical fighting. This form of fighting uses barely or no chakra at all. It takes a lot of speed and strength to master taijutsu.
Speed - How quick you are. Speed determines how well you can dodge an attack or hit something. The more speed you have, the quicker you'll be.
Will - This is a special type of skill. It practically determines your courage in fighting. As a ninja gets older, they will become braver and stronger both physically and mentally. Their Will is what keeps them going in a fight.
For every 10 Ninjutsu points, you'll be able to learn a new D-ranked ninjutsu technique. For every 20 Ninjutsu points, you'll be able to learn a new C-ranked ninjutsu technique. For every 50 Ninjutsu points, you'll be able to learn a new B-ranked ninjutsu technique. For every 100 Ninjutsu points, you'll be able to learn a new A-ranked ninjutsu technique. For every 200 Ninjutsu points, you'll be able to learn a new S-ranked ninjutsu technique.
For every 10 Genjutsu points, you'll be able to learn a new D-ranked genjutsu technique. For every 20 Genjutsu points, you'll be able to learn a new C-ranked genjutsu technique. For every 50 Genjutsu points, you'll be able to learn a new B-ranked genjutsu technique. For every 100 Genjutsu points, you'll be able to learn a new A-ranked genjutsu technique. For every 200 Genjutsu points, you'll be able to learn a new S-ranked genjutsu technique.
For every 10 Taijutsu points, you'll be able to learn a new D-ranked taijutsu technique. For every 20 Taijutsu points, you'll be able to learn a new C-ranked taijutsu technique. For every 50 Taijutsu points, you'll be able to learn a new B-ranked taijutsu technique. For every 100 Taijutsu points, you'll be able to learn a new A-ranked taijutsu technique. For every 200 Taijutsu points, you'll be able to learn a new S-ranked taijutsu technique.
Note:: Everytime you are able to learn a new jutsu of any level, you are not required to learn a new one if you don't want to. Also, on a side note, you may learn more than one jutsu at once if you have the required stats.