Learn the “גמרא דף כה: ” ההיא אבוורנקא (four lines from bottom of the amud) until דף כו (two dots)
Clarify where it was prohibited to carry and why?
What did רב הונא בר חיננא do and how did it permit carrying?
Why did Rava remove the posts?
Did רב פפא & רב הונא בריה דרב יהושע agree with Rava or argue with him?
Learn the רש”י דף כו. “להרע which gives an entirely new explanation in the Gemara