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Questions and inquiries WeChat: Le-studyg; This course will provide an in-depth analysis of the basic concepts and principles of processes, as well as their key role in program execution. The course will comprehensively explain the underlying mechanism of Socket communication, including the TCP/IP protocol stack and Socket programming interface. In addition, the course will explore in detail how Nginx communicates efficiently with back-end applications (such as PHP-FPM) through FASTCGI, and the core position of Nginx in web servers. At the same time, the course will provide an in-depth explanation of the conversion principles between host byte order and network byte order, helping students understand the changing process of data during network transmission. Finally, the course will lead students to appreciate the implementation of Redis basic applications and communication protocols, master the core data structure and common commands of Redis, and understand its advantages in caching and data storage. This course is suitable for back-end development engineers, system administrators, network engineers and students who are interested in back-end technology. Through learning, students will comprehensively improve their skills and knowledge in the field of back-end development.