Group 1 - The article addresses common cooking challenges faced by beginners, such as measuring oil temperature and understanding the nature of foam produced when stewing meat [1][4]. - Expert guidance is provided by Wu Jia, Deputy Secretary-General of the Nutrition Literacy Branch of the China Health Promotion and Education Association [1][3]. Group 2 - Different oil temperatures are categorized for various cooking methods, with specific temperature ranges defined for each level of heat [5][6][7][8]. - For example, oil at 20% heat (0℃~30℃) is suitable for frying nuts, while oil at 80% heat (180℃~240℃) is ideal for frying, pan-frying, and explosive cooking [8][9]. Group 3 - The article explains that the foam produced when stewing meat is primarily due to residual blood and proteins, with the first layer of foam being undesirable and the second layer being acceptable [16][18]. - To minimize foam, it is recommended to soak the meat in water before cooking to remove excess blood [19]. Group 4 - The article discusses the importance of adding water when boiling dumplings, as it helps control the cooking temperature and prevents the dumplings from breaking [21][23][24]. - It emphasizes that the technique allows for even cooking of the dumpling filling and skin [23][24].