Network engineering courses: computer hardware, installation and debugging of network equipment (switches, routers), operating system (windows, linux), windows service, database foundation, web page making foundation, network security (monitoring, antivirus), local area network (wireless local area network), wide area network and metropolitan area network construction. You can sign up for some training courses, such as mountain wood training. Examination certificate, cisco certified, H3C certification, Huawei certification, China soft test. These certificates are well-known, so you should take the exam yourself. As far as we are concerned, some training schools in the society are not ideal at present. They study as amateurs for half a year, with little content, and can only learn the basics of network engineers. We must persevere and accumulate for a long time.