[Python] 'django-admin' is not recognized as an internal or external command, operable program...

I tried starting my own project in Django but I keep getting "'django-admin' is not recognized as an internal or external command, operable program or batch file."

C:\>cd C:\Users\Gamer Grill\Desktop

C:\Users\Gamer Grill\Desktop>mkdir django-practise

C:\Users\Gamer Grill\Desktop>cd django-practise

C:\Users\Gamer Grill\Desktop\django-practise>mkdir my_first_project

C:\Users\Gamer Grill\Desktop\django-practise>django-admin startproject first_project
'django-admin' is not recognized

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