Do not forget to git submodule init && git submodule update first!
ln -s /path/to/repo/base.vimrc ~/.vimrc
ln -s /path/to/repo/vim ~/.vim
Open vim and type :PluginInstall.
Then install Exuberant ctags or Universal ctags. Install the requisite syntax checkers for syntastic (pylint or flake8 for python, cppcheck for C++...).
cd ~/.vim/bundle/YouCompleteMe
python3 install.py --clang-completer
VimDevIcons needs a Nerd Font compatible font, so configure your terminal emulator to use it. For instance, a Nerd font patched version of Source Code Pro is available on the AUR for Arch users (nerd-fonts-source-code-pro).
Go through all these plugins and select the good ones: https://coderoncode.com/tools/2017/04/16/vim-the-perfect-ide.html
Investigate FZF, CtrlP