5 lines to put in every .vimrc (from Hacker News)

set hlsearch    " highlight all search results
set ignorecase  " do case insensitive search 
set incsearch   " show incremental search results as you type
set number      " display line number
set noswapfile  " disable swapfile

Ref: https://swordandsignals.com/2020/12/13/5-lines-in-vimrc.html