“There are several reasons to read this book. One is to have a modern point of view for the study of homogeneous structures with a special attention on holonomy. Both classical and recent results are presented and this aspect will lead the reader to a better perception of these notions. Another reason to have this book on the reading list is that it is self-contained and describes the notions to everybody having a basic knowledge of smooth manifolds, Lie groups and theory of representations.” (Marian Ioan Munteanu, zbMATH 1437.53002, 2020)