Survey of Reb Yosef Dov's insights into Teshuvah, primarily from the work, Al Hateshuvah

Survey of laws and philosophical ideas from Reb Chaim and Reb Yosef Dov relating to prayer 

Reb Yosef Dov resolves a contradiction in the Rambam whether the dimensions of the Mizbeach (altar in the Temple) have to be precise, and develops a fundamental idea regarding the Mizbeach, which Is similar to his uncles Reb Velvel's. 

Reb Yosef Dov differentiates between the sanctified structure of the Beit Hamikdash and the location upon which it rests, a concept which also applies also to Jerusalem, and which Reb Velvel also discusses

Reb Yosef Dov formulates a new understanding of the status of the Sotah scroll, and debates the issue with Reb Yitzchak Hutner 

Reb Yosef Dov analyzes the difference between Lulav on the first and second days and explains the views of the Rambam and Rashi 

Reb Yosef Dov articulates a fundamental distinction between the obligatory gifts of produce to the poor vs. the tithes to the Kohein, and the Chazon Ish disagrees with him. 

Reb Yosef Dov builds on insights from Reb Chaim and Reb Moshe to explain how we sanctify the calendar nowadays without a Jewish court

Reb Moshe and Reb Yosef Dov debate a youthful insight of Reb Ahron Soloveichik (which appears in other commentators as well), explaining the story of Moshe killing the Egyptian and the Rambam's ruling based on that

Reb Moshe and Reb Yosef Dov differentiate between two components to the sanctity of the land of Israel