This. Do not update your bio for one simple thing. Wait until you complete or rank up multiple things.You shouldn't update your bio too much until you get some training and history in.
For example, I always update my bio when I complete a field or two (like, an element or genjutsu, for example). Also, I do it when there are major RP events I'm part of, like wars.
I would suggest always keeping your training statistics updated on your profile so you can keep track of what you've learned. Then, update your bio every month or so.