Commonly Used Principles in Computing When writing code, we often have some insights and experiences. These experiences have long been summarized into principles by the predecessors. In the past year, I have been collecting various principles and constantly applying and practicing them. KISS Principle The KISS Principle is an acronym for Keep It Simple, Stupid. The KISS principle refers to the principle that simplicity should be emphasized in design. Summarizing the experience of engineering professionals in the design process, most system designs should remain simple and pure, without incorporating unnecessary complexity, so that the system can operate optimally.