To open up a split view, type in
The first will open up a horizontal split view, while the latter will open up a vertical one.
To move your cursor between views, type in
<Ctrl> [w] + [h]
<Ctrl> [w] + [j]
<Ctrl> [w] + [k]
<Ctrl> [w] + [l]
where h,j,k,l will move into the corresponding directions, i.e., left, down, up, and right.
To change size automatically, type in
<Ctrl> [w] + [=]
For manual size manipulation, type in
:vertical resize 60
where the first will move the horizontal divider, while the second will move the vertical divider.
To quit all views at once, type in
where the first will save and exit all views, while the latter will quit all views without saving.
Lastly, for easy navigation between split views, append the following into ~/.vimrc file:
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 should now be able to navigate between split views with