We're in the information age, and the internet provides you with the ideal medium to exchange know-how for money. Do you know the best fishing holes? How to play guitar? The secrets to a successful marriage? A recipe for moist and delicious brownies? A trick for saving gas?
Think about your career, your hobbies and your interests. Virtually anything you know can be turned into extra cash. And don't worry if you think you're not an expert--as long as you know more than the average person on the topic, that information is valuable.
However, if you don't believe you know anything that others would pay for (highly unlikely), you can take someone else's know-how and make money that way! It could be as easy as interviewing a veterinarian to help you create a dog-training product.
Ninety-two percent of people go online looking for information, and you could be one of the many people cashing in on selling it.