~のが      => Nominalize verbs N5
Nominalization
のが好き/のが嫌い => Like (doing something)/Hate (doing something) N4
とは[裏腹「うらはら」] => Contrary to A, opposite of A, ... N1
Contrast/Surprise
くらいの => Approximate~ N3
Emphasis on degree
のが~です => to be N4
さすがの...も => even ~also N2
The highest (comparative) level
どのくらい => how long N5
~んがため(に)/~んがための      => in order to ~ N1
に気がつく => to notice; to realize N4
... のが...です => Highlight interests and skills N4
Abilities, interests
~には~の~がある      => has its own~ N3
Characteristic
のが上手 => to be good at doing something N5