Ellis Parker, MSN, RN, from Level Up RN, discusses the different levels of health prevention—primary, secondary, and tertiary—and the significant role of health determinants. She uses the community health section of their fundamentals flashcard deck to explain how primary prevention focuses on disease avoidance through education and immunizations, secondary prevention targets early disease detection through screenings, and tertiary prevention aims to manage disease post-diagnosis through treatments like rehabilitation. Ellis emphasizes the impact of environmental and social factors on health, offering insights into how these determinants influence individual health outcomes.