How do we come to know metaphysical truths? How does metaphysical inquiry work? Are metaphysical debates substantial? These questions characterize metametaphysics. This book, the first systematic student introduction to metametaphysics, discusses the nature of metaphysics - its methodology, epistemology, ontology and our access to metaphysical knowledge. It provides the basics of metametaphysics, covering topics in metaontology such as existence, quantification, ontological commitment and ontological realism. Contemporary views are discussed along with those of Quine, Carnap and Meinong. Beyond metaontology, treatment is given to novel topics in metametaphysics: grounding, ontological dependence, fundamentality, modal epistemology, intuitions, thought experiments and the relationship between metaphysics and science. The book is an essential resource for those studying advanced metaphysics, philosophical methodology, metametaphysics, epistemology and the philosophy of science.