Sharia Law: This is Islamic law derived from both the Quran (Islam's holy book) and Hadith (sayings and actions of Prophet Muhammad). It covers all aspects of life including religious obligations, daily routines, business ethics, etc.
Sunni & Shia: These are two major sects within Islam. Sunni Muslims form majority and believe that any righteous Muslim can lead the community whereas Shia Muslims believe leadership should stay within Prophet Muhammad's family line.
Jihad: In Islamic context, it refers to striving or struggling for a moral cause. While often misinterpreted as "holy war", Jihad primarily refers to an internal spiritual struggle towards self-improvement.