In the article there is presented, what is most important in the structure of the fundamental particles of matter and what is the cause of interactions between them, and there are also presented in it the fundamentals of material structures. In the article are presented two faces of two most important particles, which are the basis of the structure of matter - protons and neutrons. There is also presented a third fundamental particle of matter - protoelectron. From a very large number of such protoelectrons when they end up in areas of other centrally symmetric fields (ie, in the areas of protons and neutrons, near the centers of these fields) there are forming complex structural systems, which have a certain durability. These structural clusters of protoelectrons are precipitated from protons and neutrons in the process of collisions between them and they are known as electrons and other particles of matter that occur during collisions.