1, novices can choose according to their own priorities, such as making glue and sugar in a hurry, which fluctuates quickly and rarely stops; Slow-tempered people can make cotton and plastic, and don't move most days; 2. Novices can choose according to their risk tolerance. Those with strong tolerance choose those with large fluctuations, such as stock index and silver, and those with poor tolerance choose those with small fluctuations, such as soybean meal. 3. Beginners who want to practice frying can start with small varieties, such as corn, soybean meal, soybean oil and sugar. Make a choice according to your own situation. In particular, you need to be clear about your position, whether you are a band or a speculator.