Remove Git Hub related files - github-for-windows

Question

I am learning Git Hub. So I am a newbie.
Trying to remove git related files in project directory. I used this line:
rd .git /S/Q
However it gives me this error when I use VS Code:
Remove-Item : A positional parameter cannot be found that accepts argument '/q'.
At line:1 char:1
+ rd /s /q .git
+ ~~~~~~~~~~~~~
+ CategoryInfo : InvalidArgument: (:) [Remove-Item], ParameterBindingException
+ FullyQualifiedErrorId : PositionalParameterNotFound,Microsoft.PowerShell.Commands.RemoveItemCommand
and when I use CMD - command promt it gives me this error:
.git\refs\remotes - The directory is not empty.
What is going on.
This is where I get my information about this:
From stackoverflow
From YouTube
I am using Windows 10 btw.
EDIT:
I tried:
rd /S /Q .git
and I get error:
Remove-Item : A positional parameter cannot be found that accepts argument '/Q'.
At line:1 char:1
+ rd /S /Q .git
+ ~~~~~~~~~~~~~
+ CategoryInfo : InvalidArgument: (:) [Remove-Item], ParameterBindingException
Tried:
rd /S/Q .git
Error:
Remove-Item : A positional parameter cannot be found that accepts argument '.git'.
At line:1 char:1
+ rd /S/Q .git
+ ~~~~~~~~~~~~
+ CategoryInfo : InvalidArgument: (:) [Remove-Item], ParameterBindingException
However I tried in command promt:
rd /S /Q .git
And I get :
.git\refs\remotes - The directory is not empty.
I try it second time right after that and it works...
So what am I missing here?
EDIT 2:
All of these comands work in command promt but only if I type them for the second time. Including the command - rd .git /S/Q.
The first time I get :
.git\refs\remotes - The directory is not empty.
and if I type it for the second time it works.
In VS Code it is not working no matter how many times I type them.