(FYI: The OS is macOS Big Sur (11.6))

I tried to customize the ZSH terminal shell (e.g. prompt, auto-completion behavior) by editing the ZSH files, but failed. I have tried both the following, and none worked:

1. Edit ~/.zshrc:

When I tried to edit the (blank) file (even under the sudo command), I got the following error message: ".zshrc" E166: Can't open linked file for writing (similar problem happens when trying on .zshenv

2. Edit /etc/zshrc

This worked, until the computer restarted and resets the file.

What is the correct way to deal with this? Thank you very much!

I tried to customize the ZSH terminal shell (e.g. prompt, auto-completion behavior) by editing the ZSH files, but failed. I have tried both the following, and none worked:

1. Edit ~/.zshrc:
   
   When I tried to edit the (blank) file (even under the sudo command), I got the following error message: ".zshrc" E166: Can't open linked file for writing (similar problem happens when trying on .zshenv.
2. Edit /etc/zshrc:
   
   This worked, until the computer restarted and resets the file.

What is the correct way to deal with this?

_{N.B.: I'm running macOS Big Sur 11.6.}