Installation mechanics

Hi.

Could you please help with information regarding Grav installation process.
How deep does Grav goes to system? Does it unfolding only inside the site directory (i. e. the directory we put it in)?
Or does Grav also affect the system folders?

Thanks in advance.

Thank you a lot.

So in purpose of clean installation, if I need to delete Grav completely, just clean the directory of it? Will it be enough to be sure that there is no traces of old installation?

Yes. There's no database and even cache has a dedicated folder in the root of itself