question #1 Sahih Muslim 464a, Book 4, Hadith 199 : What is the significance of reciting specific Surahs during prayer?

I heard al-Bara’ narrating it from the Messenger of Allah (ﷺ) that while in a journey he said the night prayer and recited in one of the two rak’ahs:” By the Fig and the Olive” (Su’rah xcv.).