question #3 Sahih Muslim 599, Book 5, Hadith 191 : Why is the recitation of Surah al-Fatiha considered essential in the prayer according to Islamic teachings?

Abu Huraira reported that when the Messenger of Allah (ﷺ) stood up for the second rak’ah he opened it with the recitation of the praise of Allah, the Lord of universe (al-Fatiha), and he did not observe silence (before the recitation of al-Fatiha).