The whole world with its diversity we can bring down to the structure of a single atom and to stop further debates and discussions. Indeed, if we look through a powerful microscope, the diversity of nature will turn into protons, neutrons, electrons, etc. Modern science is replete with various theories trying to explain the essence of the Universe and the cause of its existence. In one case a new theory replaces the old one; in the other – confirms traditionally recognized previous theories. In our time it is important not to get lost in such a huge array of information. In this work we will review the main principles on which rest nature and its laws, which will give you an opportunity to understand the consistency of different theories on your own.