[UPDATE] add key mapping in vim.md (#333)

docs/必学工具/Vim.en.md

@@ -20,6 +20,20 @@ There is a vast amount of learning material available on Vim, but the best way t
 - Use Vim's own `vimtutor` to practice. After installing Vim, type `vimtutor` directly into the command line to enter the practice program.
 - Then you can force yourself to use Vim for development, and you can install Vim plugins in your favorite IDE.
 - Once you're fully comfortable with Vim, a new world opens up to you, and you can configure your own Vim on demand (by modifying the `.vimrc` file), and there are countless resources on the Internet to learn from.
+- If you want to know more about how to customize Vim to suit your needs, [_Learn Vim Script the Hard Way_](https://learnvimscriptthehardway.stevelosh.com/) is a perfect start point.
+
+## Remapping Keys
+
+Ctrl and Esc keys are probably two of the most used keys in Vim. However, these two keys are pretty far away from home row.
+In order to make it easier to reach these keys, you can remap CapsLock to Esc or Ctrl.
+
+On Windows, [Powertoys](https://learn.microsoft.com/en-us/windows/powertoys/) or [AutoHotkey](https://www.autohotkey.com/) can be used to achieve this goal.    
+On macOS, you can remap keys in system settings, see this [page](https://vim.fandom.com/wiki/Map_caps_lock_to_escape_in_macOS).
+
+A better solution is to make CapsLock function as Esc and Ctrl simultaneously. Click CapsLock to send Esc, hold CapsLock to use it as Ctrl key.
+
+On Windows, this [AutoHotKey gist](https://gist.github.com/sedm0784/4443120) does just this.    
+On macOS, this [karabiner rule](https://ke-complex-modifications.pqrs.org/#caps_lock_tapped_escape_held_left_control) does the magic.
 
 ## Recommended References
 

docs/必学工具/Vim.md

@@ -20,6 +20,19 @@ Vim 的学习资料浩如烟海，但掌握它最好的方式还是将它用在
 - 用 Vim 自带的 `vimtutor` 进行练习，安装完 Vim 之后直接在命令行里输入 `vimtutor` 即可进入练习程序。
 - 最后就是强迫自己使用 Vim 进行开发，IDE 里可以安装 Vim 插件。
 - 等你完全适应 Vim 之后新的世界便向你敞开了大门，你可以按需配置自己的 Vim（修改 `.vimrc` 文件），网上有数不胜数的资源可以借鉴。
+- 如果你想对配置 Vim 有更加深入的了解，[_Learn Vim Script the Hard Way_](https://learnvimscriptthehardway.stevelosh.com/) 是一个很好的资源。
+
+## 关于键位映射
+
+用 Vim 编辑代码的时候会频繁用到 ESC 和 CTRL 键, 但是这两个键都离 home row 很远, 可以把 CapsLock 键映射到 Esc 或者 Ctrl 键，让手更舒服一些。
+
+Windows 系统可以使用 [Powertoys](https://learn.microsoft.com/en-us/windows/powertoys/) 或者 [AutoHotkey](https://www.autohotkey.com/) 重映射键位。    
+MacOS 系统提供了重映射键位的[设置](https://vim.fandom.com/wiki/Map_caps_lock_to_escape_in_macOS)，另外也可以使用 [Karabiner-Elements](https://karabiner-elements.pqrs.org/) 重映射。
+
+但更佳的做法是同时将 CapsLock 映射为 Ctrl 和 Esc，点按为 Esc，按住为 Ctrl。
+
+Windows 系统下，这个[AutoHotKey gist](https://gist.github.com/sedm0784/4443120) 实现了这个功能。    
+MacOS 可以导入[这个 karabiner rule](https://ke-complex-modifications.pqrs.org/#caps_lock_tapped_escape_held_left_control) 重映射。
 
 ## 推荐参考资料