This open access book offers innovations in how sustainability is studied, taught, and practiced across academic and professional contexts. The book captures the richness of current principles and practice in sustainability from diverse geographical and academic perspectives. The reader is guided through four structured thematic sections: Teaching, Learning and Understanding 'Sustainability'; Core Debates and Controversies in Sustainability; Transdisciplinarity and Sustainability in Practice; The Role of Higher Education and Academia in Sustainability. Designed as a hybrid publication, the book combines pedagogical features--such as study exercises and learning prompts--with the thematic depth of a scholarly edited volume. This format makes it invaluable for students, educators, researchers, practitioners, and policymakers seeking both foundational knowledge and advanced insights to sustainability research.