This is a very important series handles the issues of evolution of the Islamic law over the history. It discusses the following issues: Importance and Sources of fiqh, different fiqh schools, the imams and their teachers, biography of the Four Imams, popular students, our position with mazahib, how to be on the path of moderation, fundamentals and principles of jurisprudence, categories of rulings, sources of different rules of fiqh, the classification of Sunnah, preservation of Sunnah, Sunnah vs modernism, Sunnah vs Innovation, disagreements of mazahib, the reasons of the disagreements of mazahib, our position from the disagreements of mazahib and finally conclusion of the series.