In today's Internet era, many people want to enter the IT industry, and then they start to crazily learn C/C++, python, Java and other languages. They have learned a lot of languages, but when it comes to actual projects, they still know nothing. I think many novices think that the more languages they learn, the better, but this is not the case. Until later, I got inspiration from some big guys. For novices, computer network knowledge is the most important than the language itself.