Use :sp to split the current window in two (:vs for vertical split).
Add the following mapping commands to your .vimrc for easier split navigation.
"easy split navigation
nnoremap <C-J> <C-W><C-J>
nnoremap <C-K> <C-W><C-K>
nnoremap <C-L> <C-W><C-L>
nnoremap <C-H> <C-W><C-H>You can now use ctrl+j to navigate to the split below, ctrl+l to navigate to the split on to your right and so on.