To learn a jutsu you should RP a minimum of words(depending on jutsu rank) of you learning a jutsu.
Then you do an action post. Action post is a post where you Random roll the activation of the jutsu 20 times.
If the activation is successful 10 times, you learn the jutsu, If not you have to repeat the whole process again(including the RP).
If you fail learning a jutsu, you will get exp depending on the quality of your RP, if it is successful you will get the jutsu only.
D-rank: 100 words
C-rank: 200 words
B-rank: 300 words
A-rank: 400 words
S-rank: 500 words
All the current learn-able jutsu are in the jutsu handbook.