Python Manage.Py
Start project and start app are very different commands. With the first one you create a project which will have a base structure to work on. The second command is used to create apps which you could classify as controllers. Each app will live in a folder where you will program the business logic and bind endpoints.
I am very New to Python web development ,so got confuse while learning ,when we create new Project with the command --django-admin startProject 'ProjectName' 
It Created a project folder in my drive  and then we  create application in it  suppose with the name of "calculator", we start working in it ,
but after some more  requirement we have to  create a new different Project with the Name of the Hrms so the question arise for this again we have to run the same command django-admin startProject 'ProjectName' and then we have to create application in it or we  can create in it?