Among the books of Tafsir, Sirah, and Fatawa available in a home library, which is most prioritized for reading?

One of the meanings of divine methodology (Rabbaniyyah) in learning is to begin with what is most important, then what is important; with what is easy before what is difficult; with a little before a lot; and with what is near before what is far, in observance of Allah's cosmic laws. The Prophet, peace and blessings be upon him, commanded Mu'adh to begin by inviting the people of Yemen to the Oneness of Allah, then to prayer, and then to zakat. Therefore, one should begin by learning the fundamentals of faith (Usul al-Iman), then the pillars of Islam, and start with easy books before progressing gradually.