The text sets out the fundamentals that underpin ecology - the study of the relations between organisms of the same of different species and between organisms and the abiotic (non-living) environment. In other words, it is the study of where we live. The structure of the book follows the classical style followed by most educators teaching this subject. It is divided into seven chapters which could be the basis of a semester's learning. Non-specialist, jargon-free language is used throughout with technical words and phrases explained in the text and in a glossary. Each chapter begins with an overview of the key themes covered and ends with suggestions for further, self-directed study. Chapter 1 is an introduction to the subject and contains outlines of how the subject has developed, its relevance today, and the skills required by an ecologist. Chapters 2 - 7 address, in turn, the abiotic (non-living) environment, adaptations of organisms to their abiotic environment, population ecology, community ecology, ecosystem ecology, and landscape ecology. Cross-cutting themes such as behavioural ecology, aquatic ecology, and terrestrial ecology are woven throughout these chapters. Relevant case studies, based on twenty-first century global challenges (changing climate, urbanisation, the biodiversity crisis, and the spread of invasive non-native species) and ecological ways of tackling these issues (nature-based solutions and species and habitat conservation (including rewilding)), are presented in relevant chapters. In Ecology: The Basics the author synthesises ecological understanding to provide a foundation for first- and second-year undergraduates who are approaching ecology for the first time or are looking to refresh their knowledge. Ecology: The Basics also serves as a foundation for those coming to ecology as part of their higher-level studies, or who wish to be more informed about ecology as part of their life-long learning journey.The text sets out the fundamentals that underpin ecology - the study of the relations between organisms of the same of different species and between organisms and the abiotic (non-living) environment. In other words, it is the study of where we live.