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?).
Moreover, you can also use Word templates for letterheads, invoices and even for monthly business reports. This is because it is integrated with other Microsoft Office programs such as excel. This way, you can import graphs and other objects necessary for completing a well formatted report. There really is a long list of uses for Microsoft Word. You will certainly find it useful whether you are a student, a professor, a businessman, a home maker or whoever you are from whatever industry.