As the result of human cognition, knowledge is a concept with great extension  It generally includes four levels or aspects, namely, common sense, experience generalization, scientific knowledge and philosophical knowledge  The so-called common sense mainly includes common knowledge such as sayings and proverbs, which is often not an understanding of the nature and laws of things
Scientific knowledge is a theoretical system, which is logical and systematic
Compared with scientific knowledge, there are many aspects of common sense that can't stand scrutiny, that is, it contains many mistakes.