You can go to Shenzhen Xinqidian computer maintenance training to find out. Tuition there is not expensive, but you can also learn real skills. I studied motherboards and notebooks there, and now I work as a motherboard engineer at Foxconn, with good pay. The teachers there give lively lectures and there will be many practical opportunities in the afternoon. If you really want to learn, you can go to them to audition for free. Look around more before you choose. It was just that there was not much money at that time. I went to several more. Satisfied with the new starting point's curriculum and teachers, I signed up. Now I often contact teachers, and I can ask them any questions.