If you look around, you'll notice that everything is labeled. From a small jar to a large office desk, each and every item is bound to have at least one label. Labeling things is useful, easy and practical, and the applications are virtually endless. You can find a wide variety of labels available on the market, in different shapes and sizes, styles, designs, colors, materials, templates and so on.
Perhaps a good subtitle would be, "How do I earn a bit of money when I learn how to create a business letterhead in Word." Because you can always find ways to monetize your knowledge (that's what knowledge is for, isn't it?).