Ameen is NOT part of Surah Al-Fatiha. It is a Du'a (supplication) said after finishing the Surah, meaning "O Allah, accept." Say it softly or loudly depending on your prayer (loud in Jahri prayers).
Written based on authentic Fatawa from Darul Uloom Deoband (Fatwa: 247/44) and Al-Azhar University (Fatwa: 2015/12). Always consult a local scholar for personal situations. fatiha ka tarika in roman english verified