First, get vim-plug:
https://github.com/junegunn/vim-plug
Install as it says in the instruction.
Then run installer:
./install.sh
First time opening vim
might give you some errors, those are the missing plugins
:PlugInstall
Reboot vim or nvim or gvim or macvim (it works on all).
I use coc
for the auto-complete, each extension requires its own care, but in general you need nodejs
installed, install via apt or do:
curl -sL install-node.now.sh/lts | bash
And that's it, enjoy.