I searched on gitHub and found the source codes of some frameworks, but I didn’t find codes similar to a certain management system or a certain project. In open source China, I also only saw some domestic open source framework source code recommendations. I want to learn more, and since I have never used it, I am a novice, so I hope you can tell me what you know, thank you very much.
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學習是最好的投資！
Thank you for inviting me to answer, but this question is not your current problem. I recommend laying a solid foundation first, and the first element is to learn to use Baidu. Baidu and Google are the special skills of programmers.
It is very easy to find the source code. If you search online, download java source code, and java source code, a bunch of them will appear. I suggest you dig it out yourself
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
