What is the correct methodology for seeking knowledge after memorizing the Holy Quran, and should one master a branch of knowledge before moving on to another, and how accurate is the understanding that the supplication of Dhul-Nun guarantees the acceptance of the supplication that follows it?

It is advisable to proceed gradually in seeking knowledge of the Sacred Law, by taking a portion from each discipline and starting with the most important, especially the obligations that every accountable individual must know, before specializing. The fundamental principle in seeking knowledge is to receive it from shaykhs. For information on the methodology of seeking knowledge, please refer to fatwas: 135853, 135959, 177737. As for the methodology of the Salaf in seeking knowledge, it is recommended to refer to the book "Min Hady al-Salaf fi Talab al-Ilm" (From the Guidance of the Salaf in Seeking Knowledge) by Abu Yasir Muhammad ibn Matar al-Zahrani.