This could be the start of a beautiful story, called "how I borked my Linux Mint installation on the first day by pretending Linux = Windows." It doesn't have a happy ending
Not to worry, we're here to help write a better story
First, generally the various Linux distros have a filesystem layout based on the Filesystem Hierarchy Standard, which you can access here: https://wiki.linuxfoundation.org/en/FHS
. Generally a program's static files are installed in /usr, which you normally have no reason to modify, and it's system-wide configuration files are installed in /etc, which you would modify sometimes. Your personal preferences are saved by the program as you use it in hidden files or folders in your home folder (press Ctrl+H to show these), or you can create these as you need them.
vim has a system-wide configuration file in /etc/vim/vimrc, but you wouldn't normally edit this. You would edit, or first create, the .vimrc file in your home folder for your personal preferences. Read the documentation for help on this; here is the online copy of the relevant section: http://vimdoc.sourceforge.net/htmldoc/s ... -settings/
vim plugins or scripts are generally also installed in your home folder, in the folder called .vim.
There are various other resources available for help with vim: http://www.vim.org/docs.php
. Perhaps good to start there.