Teen entrepreneurs can often earn money doing what they love. A math whiz or history buff can market herself as a tutor to other youth, while a talented musician can offer piano or guitar lessons. Teens who are computer-savvy can earn money setting up home computer systems for neighbors, addressing computer problems or building websites. Reliable teens with access to a car or bike can establish an errand-running service for older or home-bound neighbors. Artistic teens can paint murals or develop marketing posters for individuals or companies.