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Which is better to learn car repair, machine repair, sheet metal and electromechanical in Audi 4S shop?

Machine maintenance and electromechanical are machine maintenance in 4S shop. It will take about five years for machine repair and sheet metal to be fully competent. Can basically work independently, at least 2 years. Mechanical repair is more complicated than sheet metal, with more solid theoretical knowledge and fierce competition. The best machine maintenance and sheet metal income are not much different, about 8000. Sheet metal is easier to learn, and the versatility of technology and experience is stronger.