I'm learning VIM (neovim)

My VIMRC file will be update according to my learning process. There is a tips file.

Set $VIMCONFIG

$ mkdir -p ~/.vim  
$ export VIMCONFIG=~/.vim/  

Installing vim-plug

$ curl -fLo ~/.local/share/nvim/site/autoload/plug.vim --create-dirs \
    https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim