Mishpacha Magazine wrote an article about the Monsey Viznitz Rebbe zt”l after his petira. I believe it was the March 21, 2018 issue. You can find an excerpt on their website and you can request the entire article.
Learning was very, very important to him. He had his chassidim send him monthly lists of the times they learned each day.
He asked that if anyone wants to do a “toivah” for his neshama, they should learn a blatt gemora every day.
To expand a bit on the current Monsey Viznitz Rebbes:
The Monsey Viznitz Rebbe, Rabbi Mordechai Hager zt”l had 8 sons, all of whom he appointed as Rav in different communities during his lifetime.
The oldest, HaRav Pinchas Shulem zt”l, was Rav in Boro Park. He predeceased his father and his son, HaRav Yaakov Yosef is now the Rebbe in Boro Park.
The second, HaRav Yisroel, is now the Rebbe in Monsey, NY.
The third son, HaRav Mendel, is now the Rebbe in Kiamesha, NY.
The fourth son, HaRav Yitzchok Yochanan is now the Rebbe in Williamsburg.
The fifth son, HaRav Eliezer, is the Rebbe in Yerushalayim and has a new community being built in Lakewood, NJ.
The sixth son, HaRav Dovid is the Rebbe in London.
The seventh son, HaRav Aharon is the Rebbe in Montreal.
The eighth son, HaRav Boruch Shamshon, is the Rebbe in Beit Shemesh.
Shabbos in Vitznitz is very important. They start earlier than anyone else, a half hour before shkiya, and the Imrei Chaim said that there is a special olam habah for people who start 40 minutes before shkiya,
As previously mentioned, Vitznitz has their own nussach of davening that comes from HaRav Koppel Chossid, who was the Baal Tefila of the Baal Shem Tov.