question #1 Sahih Muslim 85a, Book 1, Hadith 158 : What is considered the best deed in Islam according to the teachings of the Prophet Muhammad (ﷺ)?

Prayer at its appointed hour. I (again) said: Then what? He (the Holy Prophet) replied: Kindness to the parents. I (again) said: Then what? He replied: Earnest endeavour (Jihad) in the cause of Allah. And I would have not ceased asking more questions but out of regard (for his feelings).