The book summarizes the existing positions and problems in physics, which gives the reader a general, capacious idea of ​ ​ them. The fundamental data from biology serve the same purpose. The opinions of outstanding scientists on Nature are noted. The equations substantiated and proposed by the author of a single form for describing the state of matter are given. It is shown that the properties of matter reflected by the equations of mechanics, electrodynamics, optics, thermodynamics, quantum physics can be reflected by equations of a single form, regardless of its scale (geometric dimensions) and complexity of organization. The main focus is on understanding the results from a physical point of view.