Ok, that will do. I'll explain it some more now for you.
There are two types of ninjutsu:
1) Elemental ninjutsu. You know these, they are Water, Earth, Wind, Fire, Lightning. When creating these kinds, you do Nature manipulation. You can also change the shape of them, and that's called shape manipulation. It's like the rasengan, which is the highest form of shape manipulation.
2) Normal ninjutsu: With this, it's "pure chakra". It's the thing I'm going to teach you now. You can do a lot with it, like make clones, create a rasengan, and also do other things.
Don't forget, the several families in konoha, like the hyuuga, nara, akimichi and so on are also ninjutsu-users.
Is that clear so far, pop?