How about Huitong pcb training? The school is very good, just offline training. If you have enough time, you can consider it. Training costs are quite high.

For example, I chose online training before, bought Fan Yi pcb actual combat video, and started to operate from software video. There is no foundation, because the most important thing in sketchpad is practice. After a series of systematic and phased learning, you will find yourself slowly changing from a small white to an independent drawing board.