Transition metal (i.e. essentially d block) chemistry is one of the most colourful aspects of inorganic chemistry and an understanding of its basics is essential to a graduating chemist; it is also a component of sister sciences such as geology and biochemistry. The variety of physical and chemical behaviour is very wide, so emphasis is placed on grasping the fundamentals so that this diversity can be properly appreciated. Emphasis is placed upon transition metal (TM) structure, particularly electronic structure, and bonding, and how these affect the properties of metal complexes.