AutoComplete nvim/vim macos c++ autocomplete plz help i want to try to do it

  autocomplete, c++, nvim, vim

I’m trying to install autocomplete on vim and I’m failing miserably lol. I need help my vimrc is this, I really want to fix this and would really appreciate quality from the programming community :)))))))))) :

source $VIMRUNTIME/vimrc_example.vimcall plug#begin()
Plug 'tomasiser/vim-code-dark'
Plug 'itchyny/lightline.vim'Plug 'preservim/NERDTree'
call plug#end()

Source: Windows Questions C++