I was told that according to the Qur'aan, Fiqh should be studied.

Answer

The Qur'aan is replete with verses commanding the study of Fiqh. Fiqh in its original Shar'i meaning refers to the whole of the Islam, not to any specific section of the Deen. It covered the rules of the Zaahiri (external) acts such as Tahaarat, Salaat, Saum, Hajj, Jihad, Business, Farming, Social relations, etc., as well as the Baatini (spiritual acts), viz., Aqaaid (Beliefs), and Akhlaaq (Morality).

The Qur'aan commands: "And, if you do not know, then ask the People of Thikr (i.e. the Ulama)." The term Fiqh is specifically mentioned in verse 122 of Surah Taubah. Allah Ta'ala commands in this verse the study of Fiqh. Fiqh in the Qur'aanic meaning and in the terminology of the Ulama of the first ages of Islam referred to the whole of the Shariah, not to a specific subject as it is known today.