What is a clean repository for?

Question

git

On the local, we create a working directory where we expand our repository -> work with it -> create a clean repository -> send it to the server.
There is only a .git folder in a pure repository, how will people work with it? And why it is necessary to send clean?

Answer 1

We create a clean repository on the server , of course, so that there is somewhere to push.

Answer 2

And why it is necessary to send clean?

Who said?
You can create a repository, commit a bunch of stuff there, and push whenever you want.
If you push empty, then someone else will start committing.

Answer 3

There is only a .git folder in a pure repository, how will people work with it?

It is only needed for cloning and sharing commits via pull/push. Cloning from it creates files in the latest state and downloads the history of changes. And when exchanging commits, only commits are downloaded from there or there.