Training, starting from the basic professional knowledge, and then according to the professional (milling machine, grinder, wire cut machine, lathe, numerical control, discharge, etc.) for professional training. ). Training must be synchronized, practice more operations, and don't be afraid of problems. Only in actual combat can we really test our learning quality, and then train and educate again according to the shortcomings in actual combat. It's easier said than done. It's really difficult to train new employees.