Why al-Fatiha?
It is the first surah in the mushaf, the greatest surah in it, and it is recited in every rak‘ah of every prayer — there is no prayer without it. Seven short verses you can memorise in days, and keep for life.
The evidence
«لَا صَلَاةَ لِمَنْ لَمْ يَقْرَأْ بِفَاتِحَةِ الْكِتَابِ»
There is no prayer for the one who does not recite the Opening of the Book.
Sahih al-Bukhari 756— Read the original textNote: It is called “the Mother of the Book” and “the Seven Oft-Repeated”, because it is repeated in every rak‘ah: “We have given you seven of the oft-repeated, and the great Qur’an” (15:87).