什么是WordPress子主题？有必要安装吗？
子主题的概念 | Concept of Child Theme
在上一篇笔记中，我们提到了"子主题"这个概念。如果不安装子主题，像Astra这样的免费主题安装过程甚至用不了一分钟。
In the previous notes, we mentioned the concept of "Child Theme". Without installing a child theme, the installation process for free themes like Astra takes less than a minute.
Astra子主题默认名称为"Astra Child"，其他主题的子主题通常也都会带有"Child Theme"这样的标识。
The default name for Astra child theme is "Astra Child", and other themes' child versions usually also contain identifiers like "Child Theme".
子主题的起源 | Origin of Child Theme
子主题的概念在2016年前后特别流行。当时建站经常需要修改代码、添加额外CSS，或者直接在File Manager中修改后台文件。
The concept of child theme was particularly popular around 2016. At that time, building websites often required code modifications, additional CSS, or direct backend file edits in File Manager.
如果在父主题上直接修改，很容易导致网站崩溃。而且主题升级时，所有修改都会丢失。使用子主题就能避免这些问题。
Making changes directly on the parent theme could easily crash the website. Moreover, all modifications would be lost during theme updates. Using a child theme prevents these issues.
现状分析 | Current Situation
如今子主题的概念不再那么流行，因为：
Nowadays the child theme concept is less popular because:
- 需要修改代码的情况越来越少
- There are fewer cases requiring code modifications
- 很多人不愿意直接操作代码
- Many users prefer not to directly edit code
- 大多数功能可以通过插件实现
- Most functions can be achieved through plugins
结论 | Conclusion
如果没有修改代码的需求，可以不安装子主题。但对于习惯修改代码的用户（比如我），不安装子主题会感觉不踏实。
If you don't need to modify code, you can skip installing a child theme. But for users accustomed to code modifications (like me), not having a child theme feels unsettling.
这就是为什么在上一篇教程中，我演示了子主题的安装过程。
That's why in the previous tutorial, I demonstrated the child theme installation process.
