For control and predictability
You’re now familiar with the essential alphabetic, numeric, and symbol characters. We turn to the frequently overlooked white-space characters —the keyboard characters that put blank space between point A and point B.
Control means you get the intended result with the minimum keystrokes. Suppose you need a paragraph to start at the top of the next page. What do you do? If you use a hard page break rather than a sequence of carriage returns, you get the job done with one keystroke.
Predictability means that as you edit and reformat, you’ll always get the same result. If you approximate a hard page break with carriage returns, at some point in your editing, your text will reflow and you’ll have a large, unexpected gap where you intended a page break. Then you’ll have a new problem to diagnose and fix. But a hard page break will always do the right thing.
The time you invest in learning how to use white-space characters will be paid back in layouts that snap together faster and require less fiddling.