Remember typewriters? (Those of you too young to remember those, just skip this part. Please.) Every time you heard that little ding when you approached the right-hand margin, you knew you needed to reach up, hit that bar over on the left side, and return the platen to the left margin to start a new line.
Yes, it was a pain in the neck compared to typing on a word processor. But at least then you had total control over where the line break was. These days? Not so much.
But you can still stop awkward breaks — hyphenated words or other groups of words that need to appear together on a single line — with a quick three-key combination.