"he doesn t know the first thing about anything" in German He doesn't know the first thing about anything. Der hat von Tuten und Blasen keine Ahnung. Detailed translations for "he doesn t know the first thing about anything" He doesn't know the first thing about anything. He doesn't know the first thing about anything.(also: He hasn't got/doesn't have a clue about anything.) Der hat von Tuten und Blasen keine Ahnung.