the most obvious thing about the Litvak Yeshiva [based on the Gra] is the aspect of learning in depth. (Learning "Beiyun") . This is not the same as in something like math where the basic concept is extended. In the Litvak yeshiva the way one learns is by going deeper.

I admit I did not get this for years. i did not see the difference between going deeper and going broader. so after I had finished Ketuboth in Shar Yashuv i went to the Mir and the first half year there i learned Nedarim. but then they started Ketuboth and I said to myself ''I already did ketuboth.'' and did shabat instead. but I did not realize that even though  had in fact finished Ketuboth with Tosphot and Maharsha and even a lot of Rif Rosh and Tur, that is not at all "learning in depth." That is learning a lot but not in depth.