The prohibition to not get involved in certain activities before Shabbos, similar rules found by Lulav, Chanuka, Megilla, Bedikat Chametz, and discussion why it is not mentioned by Shofar

When do the shvus (Rabbinic decrees) set in before shabbos? Communal acceptance of Shabbos, when does shabbos finish with regards to shvus?

Halacha of an item that was thrown and stuck on a brick-analysis of Tosfot, applications to babies in mothers arms, the mishkan and her vessels

Is a desert a reshut harabim? Are 600,000 people of foot traffic required as criteria for reshut harabim?

Mehalech k'omed dami of Ben Azzai, applications to standing for a zakein and talmid chacham going to a dirty alley

Doing a lesser prohibition to prevent a more severe one, the case of the cup of beer and the wrong bracha, calling off a hatzala call when there is no actual pikuach nefesh

Lifnei Iver in the case of the Mishna, tosfot vs. Other rishonim, the concept of lifnei iver as a bein adam lmakom and lechaveiro issue

Why the masechet opens with melechet hotzaa, is there is a chatzi shiur by this melacha, platas and returning cholent to the pot on shabbos, kreiva larayos of the Rambam and how its different than other prohibitions

Talmidei Chachamim Marbim Shalom Baolam, Rav Kook's comments