Asalamualykum What is meaning of ya lateef? if sir I join magrib prayer in third rakat of jamat . Is it my first rakat or not ? can we recite sana in this rakat or not , can I sit on my second rakat for jalasa after imam salam? How we proform I m confused for this provision. In one hadith it is mention that umah divided in 73 sect., what are this sect, i.e., sia , sunni breveli or deobandi please clarify?
(1) Ya Lateef means: ?O the most Kind!?
(2) You will not recite sana if you join the third rakah of Maghrib. You will recite it when you will stand up after the salam of imam, and then you will recite Surah Fatiha and any other Surah, thus you will accomplish that rakah and will sit in the qadah. In the second rakah also, you will stand and recite Surah Fatihah with a Surah as well, and then you will complete your salah after doing ruku and sajdah.
(3) Yes, the Hadith mentions 73 sects. Shia are also among them. If you want to know the details all the sects and their dogmas, you should study a book named الملل والنحل (Al-Milal Wan-Nihal).
Allah (Subhana Wa Ta’ala) knows Best
Darul Uloom Deoband