Installation

First of all let's start with basics. Pick your favorite plugin manager: Pathogen, Vundle, NeoBundle or vim-plug, just to name a few. Pathogen is the oldest, simplest, and most featureless. Vundle is very popular and I've used it for a long time before. If you're using some of Shougo's plugins, you should probably pick NeoBundle. Last but not least is vim-plug, which I've recently switched to.

• Pathogen
  • git clone https://github.com/morhetz/gruvbox.git ~/.vim/bundle/gruvbox
• Vundle
  • Add Plugin 'morhetz/gruvbox' to your .vimrc and run :PluginInstall
• NeoBundle
  • Add NeoBundle 'morhetz/gruvbox' to your .vimrc and run :NeoBundleInstall
• vim-plug
  • Add Plug 'morhetz/gruvbox' to your .vimrc and run :PlugInstall

Then add the line colorscheme gruvbox to your .vimrc file, and restart vim.

If you're using GUI version of vim that should be enough. Otherwise let me guide you through the hell of terminal specific issues.

Refer Usage page on dark and light themes switching and cursor inversions.