If you want to learn how to behave in the world, I think you only need to learn from Zeng Guofan.

If the scope is narrowed down a bit, then reading this book is enough - "Ting Jing".

This book has not many words and is divided into 18 chapters. Each chapter focuses on a core principle. These 18 principles are:

Inner sage, sharp will, family model, bright and strong, tenacity, hardness and softness, talent, honesty, diligence, deceit, long-term warfare, solidity, strict law, outer king, loyalty and doubt, lotus way, Zangfeng, Yingxu