Any type of business topics can help supplement your entrepreneurship studies. These might include accounting, finance, international business, sales, human resources, marketing, project management, supply chain, economics, business administration, or ecommerce. You may also choose to study topics related to the specific industry you're interested in. For example, if you want to open your own real estate firm, you may consider studying more about real estate law, mortgage banking, and construction and planning. If you want to open your own ecommerce store, you may consider learning more about digital marketing, web design, or graphic design.