The swap file saved my work a number of times. If you never use recover and use Vim regularly, then go ahead and disable it; if you haven't used it because you don't know how to use it or you only rarely use Vim, then I'd encourage you to either try it first or leave it enabled (as it is by default) until it becomes a nuisance. And like u/strogonoff, I also disable line numbers, but that's just personal preference of…
inoremap kj
are essential to me... press both at the same time and you exit insert mode regardless of which one gets pressed slightly faster and you never leave the home row and if you press it when you are not in insert mode it's basically a nop unless you are at the start or end of the file. even if you are you might move down or up a line accidentally but i've never had that happen personally.