All throughout the ride to the Capital, Li Qiang spent his free time in reading and meditating. While he gained a lot of knowledge from the previous Li Qiang's memory, he was aware that this is not enough. He knew that the previous Li Qiang did not have the interest to study. Because of this, he is quite lacking not just in the brains department but also in the general knowledge in this world.
While Li Qiang is frustrated by this fact, he knew that he could do nothing but swallow his emotions and continue to study. Because of this, he devoured the knowledge from the books in a matter of days.
History, magic, potions, spells, and healing.