Is everything in .config/nvim/ ?

I just started to get into neovim today, and I decided to follow the first tutorial I came across (neovim from scratch) on youtube. The first thing that's done is to copy the repo into .config/nvim/. At startup nvim set up a bunch of stuff. is there anything that it sets up outside of the ./config/nvim file? Because I really dislike installing stuff on my computer that just stays even after deleting the installation folder.