The Analects of Confucius, Laozi, Mencius, Zhuangzi, Mozi.
The closest explanation to Confucius and Mencius is Li's educational philosophy, but it is not a direct explanation.
As a basic tool, The Analects of Confucius can be read by Huang Huaixin, and can refer to Yang Shuda's Annotations on the Analects of Confucius (but Huaixin case and Shu Da case are full of lies and unreliable) and Tang Minggui's History of the Analects of Confucius. If you really just want to read the basic nonsense, you can look at Li Ling's Sanggugou and the noble Analects of Confucius.
In addition, there are thirteen classics dictionary, the Analects of Confucius filial piety volume and Mencius volume, which can be used as indexes and are very convenient; And there are rubbings of Tang Shijing.
Others don't recommend buying books immediately and borrowing them casually, because the level is too low. If it's convenient to be a library, you can go to the bookshelf of China's ancient philosophy and read it in rows. If you have a high opinion, you won't buy junk books.
In addition, it is suggested to prepare a Chinese dictionary presided by Mr. Xu Zhongshu, but it is not recommended to prepare Er Ya Lin, Yang Xiong Dialect Interpretation Certificate and Shuo Wen Jie Zi Lin Zi at the same time!