From publisher blurb:
Goblins, Orcs and Trolls - ask a dozen people what they are, and you will most likely get a dozen answers. Some will draw upon folklore and fairy stories, others on legends, others on the works of JRR Tolkien and fantasy works inspired by him. Some have played other fantasy role-playing games and form their views from the way these creatures are presented in them.
In this book we offer several approaches to presenting Goblins, Orcs and Trolls in your game, drawing inspiration from historical sources, medieval and early modern folk tales and modern fantasy. Not all of them will be suitable for every game world. Use whichever version you like or mix things up, drawing inspiration from several of the versions here. You’re the world builder.