This book is a work in Irish on learning and teaching languages. It presents research from relevant academic fields, both general research and research that deals specifically with learning Irish. The book’s chapters explore aspects of the psychology of first- and second-language learning, and the basis (theoretical and practical) of various language teaching methods. Issues around the capacity of individuals to learn languages, and the processes involved in doing so, are discussed, as well as teaching methodologies which support them. Clear examples and recommendations are given to help readers understand the process of language learning and to make important decisions regarding teaching methods in different contexts.