Find a direction, whether to do WEB or desktop applications, or to do games or mobile applications and so on. Find a development language, study and experiment deeply, and spread the scope of knowledge after mastering the foundation. Operation and maintenance is mainly hands-on operation. Now most of the operation and maintenance are Linux systems. Systematic study of Linux system operation, software operation and maintenance, security protection and cluster configuration can meet the needs of most small and medium-sized enterprises. At present, servers of many enterprises are purchased from Alibaba Cloud, and the difficulty of early warning, alarming and software installation has been greatly reduced. In addition, there are many auxiliary software, so the operation and maintenance work becomes quite easy.