You don't necessarily need to store them, you can just use
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as Sydd said.
Personally, I store all jutsus in a word document and update it from time to time when I notice there are changes in the jutsu list, but I only do that because my internet can act really weird from time to time so it helps me to train people without having to wait for the list to load.
But to answer your exact question, there is not one place that you should, or where it is best, to store the techniques you've learnt.
Thanks everyone.
Question answered~