Personal point of view, for reference only: No matter which course you study, you must study fine, so that you can get a high salary. Personally, I suggest you learn injection molding. Why? Because 80% or 90% parts of most products in our daily life are plastic parts. For example, the front and rear covers of cars used to be made of hardware, but now the cars are made of plastic, and a building is broken. Electric cars are made of plastic, washing machines, air conditioners and home appliances, not plastic. The survey shows that the overall salary of plastic molds is higher than that of hardware molds, and there are more jobs. If you want to learn, you can either go to a training institution or go to a company as an apprentice and get paid. I hope I can help you! Please adopt!