I put myself through college reselling used clothes. I've made nearly $50,000 so far this year.

Courtesy of Hannah Valentine Hannah Valentine started flipping clothes in high school. It's now her full-time job. Her business helped her graduate from college with no student loan debt. She's made nearly $50,000 so far this year. She says her strategy has changed a lot over the years. This as-told-to essay is based on a conversation with Hannah Valentine, 25, cofounder of Drop Soda Market, a monthly vintage market. The conversation has been edited for length and clarity. I graduated from…