This article briefly reviews the process of my admission to Prof. Chens group and shares some learning experiences with specific examples, including asking more and obtaining more, the Lyapunov exponent condition, controlling chaos and synchronization of conservative systems, the construction of projection operators, the perturbation representation on Poincaré sections, and Prof. Chens care. These contents reflect, from one aspect, the educational ideology and noble character of the older generation of physicists such as Prof. Chen, and still have reference value for todays young teachers and students.