ls: .: Operation not permitted - Mac Big Sur Terminal Zsh Error

Recently when I tried to run ls command in the Mac Terminal Zsh shell on macOS Big Sur, I got the below error,

code2care@mac % ls
ls: .: Operation not permitted

This was really weird, I was able to fix this issue by following the below steps,

1. Click on the Apple logo on Menu Bar,
2. Select System Preferences...
3. Click on Security & Privacy,
4. Select Files & Folders,
5. Under - Allow the Apps below to access files & folders, look for terminal and check - Desktop Folder, you will get the below alert,

   "Terminal” will not have access to files on your desktop until it is quit. 
   
   
   
   You can choose to quit “Terminal” now or do it on your own later.

6. Click on Quit & Reopen
7. You will not be able to access ls and other commands in desktop.

✏️ You can get such an error while trying to access Network volumes, Download, or Documents folder if the option in Files and Folders is unchecked for Terminal.