First of all I will assume that you are using a QWERTY keyboard. My answer isn't based on my personal preference, I am simply reformulating a part of the amazing Practical Vim written by Drew Neil.
TL;DR Vim is optimized for the touch typists so your hands should stay where you learned to put them: left hand on asdf and right hand on jkl;
Neil says that putting your right hand on hjkl is a really bad thing to do. The main reason is that moving your cursor with the keys hjkl is something that should be very occasional because vim provides much faster word-wise movements or character search motion (
I'll also directly quote this part:
I use the h and l keys for off-by-one errors, when I narrowly miss my target.
Apart from that, I hardly touch them. Given how little I use the h key, I’m
happy to have to stretch for it on a Qwerty keyboard. On the flip side, I use
the character search commands often, so I’m pleased
that the ; key rests comfortably beneath my little finger.
Bonus: Even if that doesn't seems to be your case here is a tip to get rid of the beginners bad habit consisting in using the arrow keys to move: Simply add the following lines to your
.vimrc to disable totally the arrow keys:
noremap <Up> <Nop>
noremap <Down> <Nop>
noremap <Left> <Nop>
noremap <Right> <Nop>
<Nop> stands for "No Operation")