I understand that it loads the
ftplugin.vim file, but what does it really do? Does it set options (depending on the filetype)?
If I were to include this line at the start of my vimrc
filetype plugin indent on
and then I set some options after this line (like autoindent, smartindent, etc.), would it mess with them? How can I know which options are affected by a filetype plugin or indent file?