This[^] is a great resource (and fun) for learning C programming :)

My "coding monitor" is rotated 90°. With short lines (my Vim configuration breaks them at 80 characters) I can still have 2 files in a vertical split and see their full horizontal contents. It works very well if you also use a terminal (I use tmux) that allows splits, since you can have a small window at the bottom for builds, or htop, or both :)