Basic information about sedimentary rocks, their composition, structure, distribution, classification, main components of rocks and their definition is given. The main groups of sedimentary rocks, mechanisms and conditions of their formation, post-sedimentary changes, the evolution of rock formation in the history of the Earth, the theoretical, general geological and practical significance of specific rocks are described. The main methods of studying sedimentary rocks in general and their individual types, the main methods of processing analytical data are considered. For university students - geologists and geophysicists studying in the disciplines "Lithology," "Oil and Gas Lithology." It can also be used when studying geological disciplines by students of other specialties.