Optical frequency combs provide equidistant frequency markers and have applications that encompass fundamental Physics to Engineering. This tutorial will review the fundamental operational principles and latest development in the field of soliton microresonators frequency combs (micro-combs). Such microcombs provide a chipscale, compact source of coherent and broadband frequency combs, at low power and have been applied to realize chipscale frequency synthesizers, optical clocks, and applied to LIDAR, dual comb spectroscopy, microwave photonics, as well as astrophysical spectometer calibration. They utilize spatio-temporal self organization of light in the form of dissipative solitons. (C) 2019 The Author(s)