A successful online business isn't built overnight; but is the result of many late nights. If anyone says that they can teach you to make a substantial amount of money without hard work, realize they are talking through "a hole in the head and are out of their trees".
Search engines will be a way for you to generate from as little as 20% to as much as 60% of your business online (depending on what other marketing techniques you use). Since there are over 130,000,000 webpages in existence (yes that is 130 million!), it is extremely important to understand how they work and how to increase your chances of being placed in the top 20 of the search results. For example, if you were to type "music" and "CD" into the AltaVista search engine as a keyword the result would be over 1,000,000 related site URLs.