Sorry for the late reply mate.
Danzo listens to the young student as he answers his question. He knew a considerable amount of what Ninjutsu is, and how important it is to being a shinobi. It was vital. Danzo himself knew this, Ninjutsu being one of the first fields he had actually learned himself from various sensei. Although he was old, he had a large amount of knowledge, he was a legend after all.
"Very good, for a new shinobi, you seem to know quite a lot. Now, you didn't come here for theoretical aspects of Ninjutsu, but rather to learn the practical uses of Ninjutsu, in order to use it battle. Nonetheless, let us proceed forward."
Danzo says as he slams his wooden staff to the ground with great force, emphasising the beginning of learning the techniques. Danzo's face became even more serious as he looked at his student and said;
"Now, my way of teaching is simple. I will explain the technique to you, then I want you to analyse it for me. The analysis would include what the technique does, advantages to the technique and disadvantages and how you would use it in battle."
Danzo stayed quiet for a while, then starts to explain the first technique.
"The very first technique, D rank in nature, allows you to call forth needles in your mouth through the use of chakra. Once the needles are in your mouth, you will release them towards the opponent with great accuracy.
A very simple technique, allowing you to summon forth needles through the use of chakra, and release them with ease towards the opponent. Analyse it for me, I will add points if you miss them, but try your best."
Danzo says, his face unchanged and his arms crossed, beneath his robes.