question #1 Sahih Muslim 396c, Book 4, Hadith 46 : What is the significance of reciting Surat al-Fatiha in every rak’ah of prayer?

Recitation (of Surat al-Fatiha) in every (rak’ah) of prayer in essential. (The recitation) that we listened to from the Messenger of Allah (ﷺ) we made you listen to it. And that which he recited inwardly to us, we recited it inwardly for you. And he who recites Umm al-Qur’an, it is enough for him (to complete the prayer), and he who adds to it (recites some other verses of the Holy Qur’an along with Surat al-Fatiha), it is preferable for him.