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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
You should try to study more basics of C++ language its more complicated than the other High Level Languages i would recommend you to use Java,Pyhton or Javascript.
I don't do C or equivalents, but segfault means your code is trying to access memory outside of the sapce you allocated, iirc.
Segfault.