Cosmology is the science and study of the origin, current state and the future of the Universe. This field has been revolutionized by many discoveries made during the past century. This tutorial will attempt at explaining the basic cosmology and summarize the discoveries made in this regard. It gives a deep insight into the Big Bang Theory and the attempts made to discover the Extrasolar Planets. The mysterious CMB (Cosmic Microwave Background Radiation) and its anisotropies which have intrigued astronomers for several years has been explained in detail here. This tutorial will be very useful for budding scientists and astronomers.