If you really want to do this, you should think about what you are interested in and find some technologies you like. Let me give my opinion. Now that the mobile phone industry is so developed, you can choose to learn mobile phone maintenance (this is the work of assembly and disassembly). There are so many mobile phones in Apple now that it is impossible to change the screen without a few hundred dollars. Moreover, there are not many technicians who can maintain the mainboard level, and the market is not very transparent. Not many people know how to do it, so they can choose to study. Guangzhou crazy training teaching is very strict, and you can learn real skills. You are still here, you can learn and grow.