Health Foundations in International Cooperation is a free open-access learning resource covering the conceptual and normative frameworks that underpin health, public health, global health, and humanitarian health in international cooperation settings. It examines the distinctions and relationships between these fields, the main cooperation approaches (direct service delivery, support to essential services, and health system strengthening), and the three major normative frameworks that guide how to protect population health: universal health coverage, primary health care, and the social determinants of health. The resource critically explores the progress made and the persistent gaps, tensions, and political pitfalls that undermine the right to health in practice. It includes six pages, AI-assisted reflection exercises on each page, and an integrated case study set in a conflict and displacement context. Designed for humanitarian health practitioners, public health students, and international cooperation professionals, it draws on WHO, UNICEF, and World Bank frameworks, landmark reports such as the WHO Commission on Social Determinants of Health, and the historical trajectory from tropical medicine to global health. Available in English and Spanish at no cost.