If you first used vi and are annoyed that vim does not go back into command mode
when you hit a cursor key put this in your .vimrc file.
For poeple who started using vi in the 1980's this makes vim usable.
" go back to command mode
" as soon as a curcor key is pressed
inoremap <left> <esc><left>
inoremap <right> <esc><right>
inoremap <up> <esc><up>
inoremap <down> <esc><down>