question #1 Sahih Muslim 795b, Book 6, Hadith 285 : What is the significance of reciting Surah al-Kahf in relation to tranquility and peace?

I heard al-Bara’ as saying that a man recited al-Kahf when an animal was there in the house and it began to take fright. And as he looked around, he found a cloud overshadowing it. He mentioned that to the Messenger of Allah (ﷺ). Upon this he said: O so and so, recite on (the surah) as- Sakina descends at the (recitation of the Qur’an) or on account (of the recitation) of the Qur’an.