بسم الله الرحمن الرحيم
Please study these books: Talimuddin, Deen Ki Batain, Islam Kia Hai, Islam Me Padosiyon Ke Huquq etc, it will benefit you a lot, in-shaAllah.
Allah knows Best!
Darul Uloom Deoband
This answer was collected from the official ifta website of Darul Uloom Deoband in India.