From a recent reddit post I saw: https://old.reddit.com/r/vim/comments/bm0ihb/evolution_of_a_vim_user/emt4p4a/
I keep seeing jk, am I the only one who does kj? It feels more natural to roll from the outside in than from the inside out. Is there a reason jk is more popular?
I also saw it in this answer: https://vi.stackexchange.com/a/18081/25025
For me it's more natural to roll from pinky to index finger. Therefore I chose to use kj. Also, I did a grep -rHin kj ~/src (recursive grep on the parent directory of all my source code) and found no matches.
and also this great book: http://learnvimscriptthehardway.stevelosh.com/chapters/10.html
It's typed with two separate keys, so you can "roll" your fingers instead of using the same one twice.
But I don't really know what this physically means. Could someone explain as it seems very ubiquitous in the Vim community.