This article is based on the results of a study on the problems of psychology of learning. The learning process is revealed by the author through the joint interaction of subjects, during which a common fund of semantic formations (CFSF) is formed. CFSF, according to the results of the study, is a condition for effective joint activity of people. Based on the concept of Professor S.M. Dzhakupov, joint dialogic cognitive activity will be formed only if a common fund of semantic formations is created. The article describes the stages of CFSF formation, its significance for interaction and learning, methods for diagnosing the general fund of semantic formations, and also provides an example from a study on the impact of CFSF formation on the learning process. 500 teachers participated in the study. 250 of them were in the control group and 250 teachers became participants in the experimental group. The research was aimed at studying the phenomenon of CFSF and its impact on the learning process. The results were obtained: what influences the formation of CFSF in interaction and how it, in turn, affects people during training.