does Bruno and gretel's to her take advantage of the children's innocence and what he teaches them ? how ? what what were these ideas ?

Herr Liszt focuses his teaching on history and geography, neither of which is very interesting to Bruno, but the tutor insists that he learn about "The Fatherland" (98). He disapproves of Bruno's creative mind and wants instead to teach him "about the great wrongs that have been done to you" (98). Bruno assumes Herr Liszt is referring to how Bruno has been forced to come live at Out-With, so he agrees.

By Chapter Sixteen, Gretel has replaced her collection of dolls with maps of Europe given to her by Father, which she updates using the newspapers each day as she reads about developments in the war. Her transition out of childhood naivete is represented clearly in her correction of Bruno's mispronunciation of "Out-With." It was she who first told him the name of the place, but now she corrects him. When he asks her about the fence, she explains to him that their family is "the opposite" of the Jews on the other side of the fence (183). Her understanding of the situation is still simplistic and lacks understanding: she has accepted what her Father and Herr Liszt have taught her without much critical thinking.

Yes, Herr Liszt takes advantage of the children's maleable minds to teach them what they're required to believe. They're taught not to think..... to simply follow the directions afforded by the Party.