For sure, 'Tower of God' is a must-read. It has an intricate world-building and diverse character cast. The plot twists keep you hooked from start to finish.
First, you need to have some basic knowledge of Chinese history related to the period of the novel. For example, if it's a novel set in the Tang Dynasty, know about the political system, social customs, and important events of that time. Second, pay attention to the language used in the novel. Some historical novels may use archaic Chinese, so it's necessary to study relevant language knowledge. Third, analyze the characters. Understand their motives, values, and how they interact with the historical background.