New answers tagged nominalization
To start with the easiest part, 「わかんない」 is just the Kanto colloquial pronunciation of 「わからない」, and I will use the dictionary form in my explanation. It appears to me that you are thinking of the "other"「わからない」, which is the negative form of the verb 「わかる」, are you not? The 「わからない」 in the context in question needs to be understood and treated as an ...
That の is a pronoun that indicates something aforementioned in the context. (よそ means a family that is not your own or your relatives.) "I'll buy one to give to other families first".
To me, both sound a bit clumsy. I would say this like this: 趣味は書くことと、素敵なノートや文房具を集めることと、テレビゲームをすることです。 趣味は書くことや、素敵なノートと文房具を集めることや、テレビゲームをすることです。 You can simply list two or more things ("A, B and C") using や or と. See other questions for the difference between the two, although the nuance would be small in this case: Difference between と and や～など ...
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