I know nothing about
Je ne connais rien du Japon.
I don’t know anything about Japan.
Je ne connais rien de lui, hormis son nom.
I know nothing about him except his name.
Je ne connais rien au cricket.
I know nothing about cricket.
I don't know anything about art.
Je ne connais rien de sa vie privée.
I don't know anything about their private life.
Je ne connais rien au métier d'acteur.
I know nothing about acting.
Je ne connais rien à la science.
I don't know anything about science.