First, Lao Tzu, who is well known to all, was later named Tao Te Ching.
Second, it is Li Er's "Ji Ran's Strategy", written by Nilan (Ji Ran), a student in Li Er;
Thirdly, Li Er's main activity in his later years was to continue his career of sorting out historical records. These bamboo slips will be compiled into systematic history books by Li Fake in the future. After retirement, Li Fake devoted himself to researching and sorting out ancient books. He not only clarified the chaotic historical materials, but also summed up some laws of historical development from reading history. In 350 BC, Li Fake was already an old man over 100 years old, but he was still able to visit Shang Yang of Qin State with the "Zhou Taishi" written by historical records and bamboo slips.
Fourth, according to Zhuang Zhou's "South China Classic Heaven and Earth": "Record" said:' Everything is finished, and there is no experience to return to grazing'. "The book Ji here is the title of the book, which is said to have been written by Lao Tzu.