1) The document describes various hadiths from Sahih Bukhari regarding actions that are permitted and prohibited while praying. It discusses how the companions used to speak and greet each other during prayer until it was forbidden by a Quranic verse.
2) It mentions how the Prophet waved for Abu Bakr to continue leading the prayer when the Prophet joined late, and how women used to clap instead of saying "Subhanallah" to get the imam's attention.
3) The hadiths provide guidance on proper etiquette like not spitting in front of you during prayer and leveling the ground only once when prostrating.