"Should know and should know" usually refers to the knowledge, skills and abilities that need to be mastered and familiar in a certain field, occupation or course. In education and vocational training, "what you should know and what you should know" is often used to describe the range of knowledge and skills that students or practitioners need to master. For example, in the examination, assessment or evaluation, candidates need to master a certain content of "what they should know and what they should know" in order to pass the examination or get the corresponding performance evaluation. In vocational training, practitioners need to master the skills of "knowing and responding" in order to be competent for their jobs. At the same time, the integration of knowledge and practice can also help people better understand their professional ability and career development direction, so as to better plan their study and work career. Therefore, it is a very important concept, which represents the core knowledge, skills and abilities that people need to master and skillfully use in specific fields, and is also one of the important criteria for evaluating people's learning and working ability.