Prerequisite

If not done already Install Neovim
sudo pacman -S neovim

Create config

Make directory for your Neovim config
mkdir ~/.config/nvim
Create an init.vim file
touch ~/.config/nvim/init.vim

Install vim-plug

Installs vim plug in an autoload folder. This folder auto loads plugins
curl -fLo ~/.config/nvim/autoload/plug.vim --create-dirs https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim

Add a new file for plugins

mkdir ~/.config/nvim/vim-plug

touch ~/.config/nvim/vim-plug/plugins.vim

Let's add some plugins

Add the following code to ~/.config/nvim/vim-plug/plugins.vim

" auto-install vim-plug
if empty(glob('~/.config/nvim/autoload/plug.vim'))
  silent !curl -fLo ~/.config/nvim/autoload/plug.vim --create-dirs
    \ https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim
  "autocmd VimEnter * PlugInstall
  "autocmd VimEnter * PlugInstall | source $MYVIMRC
endif

call plug#begin('~/.config/nvim/autoload/plugged')

    " Better Syntax Support
    Plug 'sheerun/vim-polyglot'
    " File Explorer
    Plug 'scrooloose/NERDTree'
    " Auto pairs for '(' '[' '{'
    Plug 'jiangmiao/auto-pairs'

call plug#end()

Source your plugins

Add the following line to init.vim
source $HOME/.config/nvim/vim-plug/plugins.vim

Vim-plug commands

Open nvim

nvim

Check the status of your plugins

:PlugStatus

Install all of your plugins

:PlugInstall

To update your plugins

:PlugUpdate

After the update you can press d to see the differences or run

:PlugDiff

To remove plugins that are no longer defined in the plugins.vim file

:PlugClean

Finally if you want to upgrade vim-plug itself run the following

:PlugUpgrade