[berrypie]

皆さんこんにちは、ちょっと問題がありますね。助けて ください。

First of all, what's the difference between なん and なに? They both can be written in 何...

Sometime I see/hear people say XXX なんです。
For example りんごが好きなんです。

Also, there is なんとか、なんで (<- I heard it from a JPOP song 「愛なんで」)... etc etc.. I am getting confused because you can't look it up in a dictionary...

お願いしますね！

Oops one more thing, from a JPOP song I heard 「なんとかなるさ」what does that mean?