It's easy. You edit the file .vimrc
usually found
in your home. This file is known as a dotfile.
You might have noticed I've been using this feature.
It can be set by :set number relativenumber
.
Yes! There are many plugins for vim. However, we will not have enough time to have a showcase of popular ones.
Yes! You can use vim-plug for example.
https://github.com/mudassir-ahmed/dotfiles/blob/master/vim/.vimrc